J/MNRAS/518/174 LSXPS Swift-XRT point sources and transients (Evans+, 2023)
A real-time transient detector and the living Swift-XRT point source catalogue.
Evans P.A., Page K.L., Beardmore A.P., Eyles-ferris R.A.J., Osborne J.P.,
Campana S., Kennea J.A., Cenko S.B.
<Mon. Not. R. Astron. Soc. 518, 174 (2023)>
=2023MNRAS.518..174E 2023MNRAS.518..174E (SIMBAD/NED BibCode)
ADC_Keywords: X-ray sources ; Surveys ; Photometry ; Spectroscopy ; Transient ;
Positional data ; Cross identifications ; Combined data
Keywords: methods: data analysis - catalogues - X-rays: general
Abstract:
We present the Living Swift-XRT Point Source (LSXPS) catalogue and
real-time transient detector. This system allows us for the first time
to carry out low- latency searches for new transient X-ray events
fainter than those available to the current generation of wide-field
imagers, and report their detection in near real time. Previously,
such events could only be found in delayed searches, e.g. of archival
data; our low-latency analysis now enables rapid and ongoing follow-
up of these events, enabling the probing of time-scales previously
inaccessible. The LSXPS is, uniquely among X-ray catalogues, updated
in near real time, making this the first up-to-date record of the
point sources detected by a sensitive X-ray telescope: the SwiftX-ray
Telescope. The associated upper limit calculator likewise makes use of
all available data allowing contemporary upper limits to be rapidly
produced on demand. These facilities, which enable the low-latency
transient system, are also fully available to the community, providing
a powerful resource for time-domain and multimessenger astrophysics.
Description:
In this work, we present the 'Living' Swift-XRT Point Source (LSXPS)
catalogue and real-time transient detector. Those data are searched
for new transients, and added to the LSXPS catalogue, meaning it is
kept up to date in nearly real time. The provision of the real-time
catalogue is essential to the transient search: a reference image is
needed to determine whether a source just detected is already known in
X-rays, and if not, what upper limit can be placed on its historical
flux. Because Swift often reobserves locations on the sky (and a
single XRT snapshot is usually more sensitive than the RASS or XMM
Slew Survey observations), it is commonly the case that the best
reference image to use is a previous Swift data set, which is now
always available in LSXPS. The basic processing of a data set for
LSXPS remains almost the same as in 2SXPS. The live status of the
numbers given here is available on the LSXPS website. The numbers
given below were obtained at 15:00 ut on 2022 August 30. The LSXPS
catalogue contains 279021 unique sources, composed from 1.5 million
blind detections across all four energy bands, or 756769 'obs sources'
(i.e see content details in section 5 and accesses in section 6).
LSXPS catalogue is also available from the UKSSDC website via
https://www.swift.ac.uk/LSXPS.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
sources.dat 2210 348599 Sources table is the main LSXPS table
sclean.dat 2210 229778 Clean subset of the source table those with a
best Det Flag of 0 or 1 for Good or Reasonable
suclean.dat 2210 202939 Ultraclean subset of the sclean table those with
Det=0 and FField=0
datasets.dat 356 284508 Information about every individual datasets,
observations and stacked images in LSXPS
dclean.dat 356 270187 Subset of datasets.dat where FFlag=0 or 1
duclean.dat 356 267428 Subset of dclean where FFlag=0
detect.dat 508 2792443 *Specific individual X-ray detections catalog in
all band before combination to create sources
obsource.dat 147 1455404 *Details of the detections in an individual
dataset, merged over all bands
xcorr.dat 80 1133795 Details of the cross correlation between the
LSXPS sources and other catalogues
oldstack.dat 44 25645 Details of the stacked images which have been
superseded by newer data
trans.dat 635 1238 Transient counterpart checked by the XRT team
and classed into 'possible transient' categories
--------------------------------------------------------------------------------
Note on obsource.dat: The process of identifying unique sources has two steps.
In the first, individual detections from different bands within a dataset are
merged to identify the objects uniquely detected in that dataset. These are
referred to as ObsSources and are available in this catalogue table.
Note on detect.dat: Each source in the Sources table has at least one entry in
this detections table; most sources have multiple entries as they were detected
in more than one band or dataset. The information in the detections table
relates to the specific detection, not to the unique source as a whole.
--------------------------------------------------------------------------------
See also:
J/MNRAS/412/1853 : Unidentified X-ray sources in XMM Slew Survey
(Starling+, 2011)
J/MNRAS/397/1177 : Swift-XRT observations of GRBs (Evans+, 2009)
J/A+A/588/A103 : Second ROSAT all-sky survey (2RXS) source catalog
(Boller+, 2016)
J/A+A/551/A142 : 7 year Swift-XRT point source catalog (1SWXRT)
(D'Elia+, 2013)
J/A+A/528/A122 : SwiftFT catalog (Puccetti+, 2011)
J/A+A/493/339 : XMM-Newton serendipitous Survey. V. (Watson+, 2009)
J/A+A/480/611 : XMM-Newton Slew Survey catalogue, XMMSL1 (Saxton+, 2008)
J/ApJS/245/15 : Swift XRT follow-up of LIGO/Virgo GW triggers
(Klingler+, 2019)
IX/58 : 2SXPS Swift X-ray telescope point source catalogue
(Evans+, 2020)
IX/56 : 3XMM-DR7s serendipitous source catalogue from stacks
(Traulsen+, 2019)
IX/46 : XMM-Newton Serendipitous Source Catalogue 3XMM-DR5
(XMM-SSC, 2016)
IX/45 : The Chandra Source Catalog, Release 1.1 (Evans+ 2012)
IX/43 : 1SXPS Swift X-ray telescope point source catalogue
(Evans+ 2014)
IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999)
Byte-by-byte Description of file: sources.dat sclean.dat suclean.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 7 I7 --- LSXPS Numerical unique source identifier
within LSXPS (LSXPS_ID)
9- 30 A22 --- IAUName IAU-format name, LSXPS
JHHMMSS s±ddmmsss (IAUName)
--------------------------------------------------------------------------------
32- 40 F9.5 deg RAdeg Right ascension (J2000) (RA)
42- 50 F9.5 deg DEdeg Declination (J2000) (Decl)
52- 55 F4.1 arcsec Err90 Position uncertainty, 90% confidence,
radial, assumed to be
Rayleigh-distributed (Err90)
57 I1 --- A Provenance of the astrometry used to
derive the source position
(AstromType) (1)
59- 67 F9.5 deg GLON Galactic longitude (l)
69- 77 F9.5 deg GLAT Galactic latitude (b)
79- 83 F5.2 arcmin OffAxis ? The mean angular distance of the
source from the XRT boresight in all
observations within which the source
was detected (MeanOffAxisAngle)
85- 92 F8.2 arcsec DNN The distance to the closest LSXPS
source to this one (NearestNeighbour)
94- 102 F9.2 arcsec DNNOK The distance to the closest LSXPS
source to this one which is ranked
Good or Reasonable and has no other
DetFlag bits set (NearestOKNeighbour)
104- 110 I7 --- NLSXPS ? The LSXPS_ID of the closest LSXPS
source to this one
(NearestNeighbour_ID)
112- 118 I7 --- GoodNLSXPS ? The LSXPS_ID of the closest LSXPS
source to one which is ranked Good or
Reasonable and has no other DetFlag
bits set (NearestOKNeighbour_ID)
120- 125 I6 --- HPPIX The Healpix pixel containing the
source (NSIDE=128, ordering=RING)
(HPPIX)
--------------------------------------------------------------------------------
127- 133 I7 s t.exp ? The total exposure at the source
location in the catalogue (Exposure)
135- 153 A19 "datime" t.start1 The UTC date & time of the start of
the first observation in LSXPS which
covered the source location
(FirstObsDate)
155- 173 A19 "datime" t.stop1 The UTC date & time of the end of the
last observation in LSXPS which
covered the source location
(LastObsDate)
175- 183 I9 s time.start1 ? The time of the start of the first
observation in LSXPS which covered
the source location, in Swift Mission
Elapsed Time (FirstObsMET)
185- 193 I9 s time.stop1 ? The time of the end of the last
observation in LSXPS which covered
the source location in, Swift Mission
Elapsed Time (LastObsMET)
195- 213 A19 "datime" t.start2 The UTC date & time of the start of
the first observation in LSXPS in
which the source count rate is
inconsisent with 0 at the 3-sigma
level (FirstDetDate)
215- 233 A19 "datime" t.stop2 The UTC date & time of the end of the
last observation in LSXPS in which
the source count rate is inconsisent
with 0 at the 3-sigma level
(LastDetDate)
235- 243 I9 s time.start2 ? The time of the start of the first
observation in LSXPS in which the
source count rate is inconsisent with
0 at the 3-sigma level, in Swift
Mission Elapsed Time (FirstDetMET)
245- 253 I9 s time.stop2 ? The time of the end of the last
observation in LSXPS in which the
source count rate is inconsisent with
0 at the 3-sigma level, in Swift
Mission Elapsed Time (LastDetMET)
255- 273 A19 "datime" t.start3 The UTC date & time of the start of
the first observation in LSXPS in
which the source is detected in the
blind search (FirstBlindDetDate)
275- 293 A19 "datime" t.stop3 The UTC date & time of the end of the
last observation in LSXPS in which
the source is detected in the blind
search (LastBlindDetDate)
295- 303 I9 s time.start3 ? The time of the start of the first
observation in LSXPS in which the
source is detected in the blind
search, in Swift Mission Elapsed Time
(FirstBlindDetMET)
305- 313 I9 s time.stop3 ? The time of the end of the last
observation in LSXPS in which the
source is detected in the blind
search, in Swift Mission Elapsed Time
(LastBlindDetMET)
315- 318 I4 --- NObs ? The number of observations covering
the position of this source (NumObs)
320- 323 I4 --- NBlind ? The number of observations in which
this source was found in a blind
search (NumBlindDetObs)
325- 328 I4 --- NDet ? The number of observations in which
this source is detected (NumDetObs)
330- 336 I7 --- IDBest The ID of the 'best' detection, (cf
the detection table) (BestDetectionID)
338 I1 --- F0 ? Whether the count-rate in the
0.3-10 keV band is inconsistent with
0 at the 3-sigma level
(NonBlindDet_band0)
340 I1 --- F1 ? Whether the count-rate in 0.3-1 keV
band is inconsistent with 0 at the
3-sigma level (NonBlindDet_band1)
342 I1 --- F2 ? Whether the count-rate in 1-2 keV
band is inconsistent with 0 at
the 3-sigma level (NonBlindDet_band2)
344 I1 --- F3 ? Whether the count-rate in 2-10 keV
band is inconsistent with 0 at
the 3-sigma level (NonBlindDet_band3)
--------------------------------------------------------------------------------
346- 347 I2 --- Det The best detection flag from all
detections of the source (DetFlag) (2)
349- 350 I2 --- FField The best field flag from all
detections of the source (FieldFlag)
(3)
352- 353 I2 --- Det0 The final detection flag 0.3-10 keV
band (DetFlag_band0)
355- 356 I2 --- Det1 The final detection flag 0.3-1 keV
band (DetFlag_band1)
358- 359 I2 --- Det2 The final detection flag in 1-2 keV
band (DetFlag_band2)
361- 362 I2 --- Det3 The final detection flag in 2-10 keV
band (DetFlag_band3)
364- 372 F9.6 mag Warning The worst optical loading warning
from all detections of this source
(OpticalLoadingWarning) (4)
374 I1 --- DetSLW Whether any detection of this source
occurred within fitted stray light
rings (StrayLightWarning)
376 I1 --- DetNBSW Whether any detection of this source
occurred within the PSF wings of a
bright object
(NearBrightSourceWarning)
378 I1 --- Dup Whether this source is potentially an
alias (i e duplicate) of another
source (IsPotentialAlias)
--------------------------------------------------------------------------------
380- 398 A19 "datime" AdDate The date at which this source was
added to LSXPS (WhenAdded)
400 I1 --- SDet Whether the source was detected in
the most recent observation of its
location (StillDetected) (5)
402- 403 I2 --- Status A bit-wise flag describing the
processing status of the source data
(ProcessedStatus)
405- 423 A19 "datime" ModDate The date at which this source was
last analysed (WhenModified)
--------------------------------------------------------------------------------
425- 433 E9.4 ct/s CR0 ? The mean count-rate in 0.3-10 keV
band (Rate_band0)
435- 443 E9.4 ct/s E_CR0 ? The 1-sigma positive uncertainty on
the mean count-rate in the 0.3-10 keV
band (Rateband0pos)
445- 454 E10.4 ct/s e_CR0 []? The 1-sigma negative uncertainty
on the mean count-rate in 0.3-10 keV
band (Rateband0neg)
456- 461 F6.3 --- HR1 ? The aggregate HR1 hardness ratio of
the source (HR1)
463- 471 F9.4 --- E_HR1 []? The 1-sigma positive uncertainty
on the aggregate HR1 hardness ratio
of the source (HR1_pos)
473- 482 F10.4 --- e_HR1 []? The 1-sigma negative uncertainty
on the aggregate HR1 hardness ratio
of the source (HR1_neg)
484- 489 F6.3 --- HR2 ? The aggregate HR2 hardness ratio of
the source (HR2)
491- 500 F10.4 --- E_HR2 []? The 1-sigma positive uncertainty
on the aggregate HR2 hardness ratio
of the source (HR2_pos)
502- 512 F11.4 --- e_HR2 []? The 1-sigma negative uncertainty
on the aggregate HR2 hardness ratio
of the source (HR2_neg)
514- 522 E9.4 ct/s CR1 ? The mean count-rate in 0.3-1 keV
band (Rate_band1)
524- 532 E9.4 ct/s E_CR1 ? The 1-sigma positive uncertainty on
the mean count-rate in 0.3-1 keV band
(Rateband1pos)
534- 543 E10.4 ct/s e_CR1 []? The 1-sigma negative uncertainty
on the mean count-rate in 0.3-1 keV
band (Rateband1neg)
545- 553 E9.4 ct/s CR2 ? The mean count-rate in the 1-2 keV
band (Rate_band2)
555- 563 E9.4 ct/s E_CR2 ? The 1-sigma positive uncertainty on
the mean count-rate in the 1-2 keV
band (Rateband2pos)
565- 574 E10.4 ct/s e_CR2 []? The 1-sigma negative uncertainty
on the mean count-rate in the 1-2 keV
band (Rateband2neg)
576- 584 E9.4 ct/s CR3 ? The mean count-rate in the 2-10 keV
band (Rate_band3)
586- 594 E9.4 ct/s E_CR3 ? The 1-sigma positive uncertainty on
the mean count-rate in the 2-10 keV
band (Rateband3pos)
596- 605 E10.4 ct/s e_CR3 []? The 1-sigma negative uncertainty
on the mean count-rate in 2-10 keV
band (Rateband3neg)
607- 613 I7 ct Ct0 ? The total number of counts in the
source region in the 0.3-10 keV band
(Counts_band0)
615- 621 I7 ct Ct1 ? The total number of counts in the
source region in the 0.3-1 keV band
(Counts_band1)
623- 629 I7 ct Ct2 ? The total number of counts in the
source region in the 1-2 keV band
(Counts_band2)
631- 637 I7 ct Ct3 ? The total number of counts in the
source region in the 2-10 keV band
(Counts_band3)
639- 646 E8.3 ct BgCt0 ? The total number of background
counts expected in the source region
in 0.3-10 keV band (BgCounts_band0)
648- 655 E8.3 ct BgCt1 ? The total number of background
counts expected in the source region
in the 0.3-1 keV band (BgCounts_band1)
657- 664 E8.3 ct BgCt2 ? The total number of background
counts expected in the source region
in the 1-2 keV band (BgCounts_band2)
666- 673 E8.3 ct BgCt3 ? The total number of background
counts expected in the source region
in the 2-10 keV band (BgCounts_band3)
675- 682 E8.3 --- CF0 ? The PSF correction factor in the
0.3-10 keV band (RateCF_band0)
684- 691 E8.3 --- CF1 ? The PSF correction factor in the
0.3-1 keV band (RateCF_band1)
693- 700 E8.3 --- CF2 ? The PSF correction factor in the
1-2 keV band (RateCF_band2)
702- 709 E8.3 --- CF3 ? The PSF correction factor in the
2-10 keV band (RateCF_band3)
711- 719 E9.4 ct/s FUL0 ? The 3-sigma upper confidence limit
on the count-rate in the 0.3-10 keV
band (UL_band0)
721- 729 E9.4 ct/s FUL1 ? The 3-sigma upper confidence limit
on the count-rate in the 0.3-1 keV
band (UL_band1)
731- 739 E9.4 ct/s FUL2 ? The 3-sigma upper confidence limit
on the count-rate in the 1-2 keV band
(UL_band2)
741- 749 E9.4 ct/s FUL3 ? The 3-sigma upper confidence limit
on the count-rate in the 2-10 keV
band (UL_band3)
751- 759 E9.4 ct/s PCR0 ? The peak count-rate in 0.3-10 keV
band (PeakRate_band0)
761- 769 E9.4 ct/s E_PCR0 ? The 1-sigma positive uncertainty on
the peak count-rate in the 0.3-10 keV
band (PeakRateband0pos)
771- 780 E10.4 ct/s e_PCR0 []? The 1-sigma negative uncertainty
on the peak count-rate in 0.3-10 keV
band (PeakRateband0neg)
782- 790 E9.4 ct/s PCR1 ? The peak count-rate in 0.3-1 keV
band (PeakRate_band1)
792- 800 E9.4 ct/s E_PCR1 ? The 1-sigma positive uncertainty on
the peak count-rate in the 0.3-1 keV
band (PeakRateband1pos)
802- 811 E10.4 ct/s e_PCR1 []? The 1-sigma negative uncertainty
on the peak count-rate in 0.3-1 keV
band (PeakRateband1neg)
813- 821 E9.4 ct/s PCR2 ? The peak count-rate in the 1-2 keV
band (PeakRate_band2)
823- 831 E9.4 ct/s E_PCR2 ? The 1-sigma positive uncertainty on
the peak count-rate in the 1-2 keV
band (PeakRateband2pos)
833- 842 E10.4 ct/s e_PCR2 []? The 1-sigma negative uncertainty
on the peak count-rate in the 1-2 keV
band (PeakRateband2neg)
844- 852 E9.4 ct/s PCR3 ? The peak count-rate in the 2-10 keV
band (PeakRate_band3)
854- 862 E9.4 ct/s E_PCR3 ? The 1-sigma positive uncertainty on
the peak count-rate in the 2-10 keV
band (PeakRateband3pos)
864- 873 E10.4 ct/s e_PCR3 []? The 1-sigma negative uncertainty
on the peak count-rate in 2-10 keV
band (PeakRateband3neg)
--------------------------------------------------------------------------------
875- 882 E8.3 --- PcstS0 ? The probability that the source
count-rate in the 0.3-10 keV band
does not vary between snapshots
(PvarPchiSnapshot_band0)
884- 891 E8.3 --- PcstS1 ? The probability that the source
count-rate in the 0.3-1 keV band does
not vary between snapshots
(PvarPchiSnapshot_band1)
893- 900 E8.3 --- PcstS2 ? The probability that the source
count-rate in the 1-2 keV band does
not vary between snapshots
(PvarPchiSnapshot_band2)
902- 909 E8.3 --- PcstS3 ? The probability that the source
count-rate in the 2-10 keV band does
not vary between snapshots
(PvarPchiSnapshot_band3)
911- 918 E8.3 --- PcstSHR1 ? The probability that the source HR1
hardness ratio does not vary between
snapshots (PvarPchiSnapshot_HR1)
920- 927 E8.3 --- PcstSHR2 ? The probability that the source HR2
hardness ratio does not vary between
snapshots (PvarPchiSnapshot_HR2)
929- 936 E8.3 --- Pcst0 ? The probability that the source
count-rate in the 0.3-10 keV band
does not vary between observations
(PvarPchiObsID_band0)
938- 945 E8.3 --- Pcst1 ? The probability that the source
count-rate in the 0.3-1 keV band does
not vary between observations
(PvarPchiObsID_band1)
947- 954 E8.3 --- Pcst2 ? The probability that the source
count-rate in the 1-2 keV band does
not vary between observations
(PvarPchiObsID_band2)
956- 963 E8.3 --- Pcst3 ? The probability that the source
count-rate in the 2-10 keV band does
not vary between observations
(PvarPchiObsID_band3)
965- 972 E8.3 --- PcstHR1 ? The probability that the source HR1
hardness ratio does not vary between
observations (PvarPchiObsID_HR1)
974- 981 E8.3 --- PcstHR2 ? The probability that the source HR2
hardness ratio does not vary between
observations (PvarPchiObsID_HR2)
--------------------------------------------------------------------------------
983- 990 E8.3 cm-2 NHg The Galactic absorption column
density (in cm-2) in the direction of
the source, determined from
Willingale et al (2013MNRAS.431..394W 2013MNRAS.431..394W)
(GalacticNH)
992 I1 --- Pow ? Which of the available estimates of
the power-law spectral ECF and fluxes
(WhichPow) (6)
994 I1 --- APEC ? Which of the available estimates of
the APEC spectral ECF and fluxes
(WhichAPEC) (7)
996-1004 E9.4 mJ/m2/ct CFO0 ? The Energy Conversion Factor from
0.3-10 keV count-rate to 0.3-10 keV
observed flux, assuming a power-law
spectrum (PowECFO)
1006-1015 E10.4 mJ/m2/ct CFU0 ? The Energy Conversion Factor from
0.3-10 keV count-rate to 0.3-10 keV
unabsorbed flux, assuming a power-law
spectrum (PowECFU)
1017-1026 E10.4 mW/m2 FPO0 ? The mean 0.3-10 keV observed flux
assuming a power-law spectrum
(PowFlux)
1028-1038 E11.5 mW/m2 E_FPO0 ? The 1-sigma positive uncertainty on
the mean 0.3-10 keV observed flux
assuming a power-law spectrum
(PowFlux_pos)
1040-1051 E12.5 mW/m2 e_FPO0 []? The 1-sigma negative uncertainty
on the mean 0.3-10 keV observed flux
assuming a power-law spectrum
(PowFlux_neg)
1053-1062 E10.4 mW/m2 FPU0 ? The mean 0.3-10 keV unabsorbed flux
assuming a power-law spectrum
(PowUnabsFlux)
1064-1074 E11.5 mW/m2 E_FPU0 ? The 1-sigma positive uncertainty on
the mean 0.3-10 keV unabsorbed flux
assuming a power-law spectrum
(PowUnabsFlux_pos)
1076-1087 E12.5 mW/m2 e_FPU0 []? The 1-sigma negative uncertainty
on the mean 0.3-10 keV unabsorbed
flux assuming a power-law spectrum
(PowUnabsFlux_neg)
--------------------------------------------------------------------------------
1089-1097 E9.4 mJ/m2/ct ECFO0 ? The Energy Conversion Factor from
0.3-10 keV count-rate to 0.3-10 keV
observed flux, assuming an APEC
spectrum (APECECFO)
1099-1107 E9.4 mJ/m2/ct ECFU0 ? The Energy Conversion Factor from
0.3-10 keV count-rate to 0.3-10 keV
unabsorbed flux, assuming an APEC
spectrum (APECECFU)
1109-1118 E10.4 mW/m2 FAO0 ? The mean 0.3-10 keV observed flux
assuming an APEC spectrum (APECFlux)
1120-1130 E11.5 mW/m2 E_FAO0 ? The 1-sigma positive uncertainty on
the mean 0.3-10 keV observed flux
assuming an APEC spectrum
(APECFlux_pos)
1132-1143 E12.5 mW/m2 e_FAO0 []? The 1-sigma negative uncertainty
on the mean 0.3-10 keV observed flux
assuming an APEC spectrum
(APECFlux_neg)
1145-1154 E10.4 mW/m2 FAU0 ? The mean 0.3-10 keV unabsorbed flux
assuming an APEC spectrum
(APECUnabsFlux)
1156-1166 E11.5 mW/m2 E_FAU0 ? The 1-sigma positive uncertainty on
the mean 0.3-10 keV unabsorbed flux
assuming an APEC spectrum
(APECUnabsFlux_pos)
1168-1179 E12.5 mW/m2 e_FAU0 []? The 1-sigma negative uncertainty
on the mean 0.3-10 keV unabsorbed
flux assuming an APEC spectrum
(APECUnabsFlux_neg)
--------------------------------------------------------------------------------
1181-1191 E11.5 mW/m2 FpPO0 ? The peak 0.3-10 keV observed flux
assuming a power-law spectrum
(PowPeakFlux)
1193-1203 E11.5 mW/m2 E_FpPO0 ? The 1-sigma positive uncertainty on
the peak 0.3-10 keV observed flux
assuming a power-law spectrum
(PowPeakFlux_pos)
1205-1215 E11.4 mW/m2 e_FpPO0 []? The 1-sigma negative uncertainty
on the peak 0.3-10 keV observed flux
assuming a power-law spectrum
(PowPeakFlux_neg)
1217-1227 E11.5 mW/m2 FpPU0 ? The peak 0.3-10 keV unabsorbed flux
assuming a power-law spectrum
(PowPeakUnabsFlux)
1229-1239 E11.5 mW/m2 E_FpPU0 ? The 1-sigma positive uncertainty on
the peak 0.3-10 keV unabsorbed flux
assuming a power-law spectrum
(PowPeakUnabsFlux_pos)
1241-1252 E12.5 mW/m2 e_FpPU0 []? The 1-sigma negative uncertainty
on the peak 0.3-10 keV unabsorbed
flux assuming a power-law spectrum
(PowPeakUnabsFlux_neg)
--------------------------------------------------------------------------------
1254-1263 E10.5 mW/m2 FpAO0 ? The peak 0.3-10 keV observed flux
assuming an APEC spectrum
(APECPeakFlux)
1265-1273 E9.4 mW/m2 E_FpAO0 ? The 1-sigma positive uncertainty on
the peak 0.3-10 keV observed flux
assuming an APEC spectrum
(APECPeakFlux_pos)
1275-1285 E11.5 mW/m2 e_FpAO0 []? The 1-sigma negative uncertainty
on the peak 0.3-10 keV observed flux
assuming an APEC spectrum
(APECPeakFlux_neg)
1287-1296 E10.5 mW/m2 FpAU0 ? The peak 0.3-10 keV unabsorbed flux
assuming an APEC spectrum
(APECPeakUnabsFlux)
1298-1307 E10.5 mW/m2 E_FpAU0 ? The 1-sigma positive uncertainty on
the peak 0.3-10 keV unabsorbed flux
assuming an APEC spectrum
(APECPeakUnabsFlux_pos)
1309-1319 E11.5 mW/m2 e_FpAU0 []? The 1-sigma negative uncertainty
on the peak 0.3-10 keV unabsorbed
flux assuming an APEC spectrum
(APECPeakUnabsFlux_neg)
--------------------------------------------------------------------------------
1321-1329 E9.4 mJ/m2/ct CECFO ? The Energy Conversion Factor from
0.3-10 keV count-rate to 0.3-10 keV
observed flux, assuming the canned
power-law spectrum (FixedPowECFO)
1331-1339 E9.4 mJ/m2/ct CECFU ? The Energy Conversion Factor from
0.3-10 keV count-rate to 0.3-10 keV
unabsorbed flux, assuming the canned
power-law spectrum (FixedPowECFU)
1341-1349 E9.4 mW/m2 FCOP0 ? The mean 0.3-10 keV observed flux
assuming the canned power-law
spectrum (FixedPowFlux)
1351-1360 E10.5 mW/m2 E_FCOP0 ? The 1-sigma positive uncertainty on
the mean 0.3-10 keV observed flux
assuming the canned power-law
spectrum (FixedPowFlux_pos)
1362-1372 E11.5 mW/m2 e_FCOP0 []? The 1-sigma negative uncertainty
on the mean 0.3-10 keV observed flux
assuming the canned power-law
spectrum (FixedPowFlux_neg)
1374-1382 E9.4 mW/m2 FCUP0 ? The mean 0.3-10 keV unabsorbed flux
assuming the canned power-law
spectrum (FixedPowUnabsFlux)
1384-1393 E10.5 mW/m2 E_FCUP0 ? The 1-sigma positive uncertainty on
the mean 0.3-10 keV unabsorbed flux
assuming the canned power-law
spectrum (FixedPowUnabsFlux_pos)
1395-1405 E11.5 mW/m2 e_FCUP0 []? The 1-sigma negative uncertainty
on the mean 0.3-10 keV unabsorbed
flux assuming the canned power-law
spectrum (FixedPowUnabsFlux_neg)
--------------------------------------------------------------------------------
1407-1415 E9.4 mJ/m2/ct AECFO ? The Energy Conversion Factor from
0.3-10 keV count-rate to 0.3-10 keV
observed flux, assuming the canned
APEC spectrum (FixedAPECECFO)
1417-1425 E9.4 mJ/m2/ct AECFU ? The Energy Conversion Factor from
0.3-10 keV count-rate to 0.3-10 keV
unabsorbed flux, assuming the canned
APEC spectrum (FixedAPECECFU)
1427-1435 E9.4 mW/m2 FCAO0 ? The mean 0.3-10 keV observed flux
assuming the canned APEC spectrum
(FixedAPECFlux)
1437-1446 E10.5 mW/m2 E_FCAO0 ? The 1-sigma positive uncertainty on
the mean 0.3-10 keV observed flux
assuming the canned APEC spectrum
(FixedAPECFlux_pos)
1448-1458 E11.5 mW/m2 e_FCAO0 []? The 1-sigma negative uncertainty
on the mean 0.3-10 keV observed flux
assuming the canned APEC spectrum
(FixedAPECFlux_neg)
1460-1468 E9.4 mW/m2 FCAU0 ? The mean 0.3-10 keV unabsorbed flux
assuming the canned APEC spectrum
(FixedAPECUnabsFlux)
1470-1479 E10.5 mW/m2 E_FCAU0 ? The 1-sigma positive uncertainty on
the mean 0.3-10 keV unabsorbed flux
assuming the canned APEC spectrum
(FixedAPECUnabsFlux_pos)
1481-1491 E11.5 mW/m2 e_FCAU0 []? The 1-sigma negative uncertainty
on the mean 0.3-10 keV unabsorbed
flux assuming the canned APEC
spectrum (FixedAPECUnabsFlux_neg)
--------------------------------------------------------------------------------
1493-1501 E9.4 mJ/m2/ct PECFO ? The Energy Conversion Factor from
0.3-10 keV count-rate to 0.3-10 keV
observed flux, assuming the power-law
spectrum interpolated from the HRs
(InterpPowECFO)
1503-1511 E9.4 mJ/m2/ct PECFU ? The Energy Conversion Factor from
0.3-10 keV count-rate to 0.3-10 keV
unabsorbed flux, assuming the
power-law spectrum interpolated from
the HRs (InterpPowECFU)
1513-1521 E9.4 cm-2 NH1H ? The hydrogen column density
inferred assuming the power-law
spectrum interpolated from the HRs
(InterpPowNH)
1523-1533 E11.5 cm-2 E_NH1H []? The 1-sigma positive uncertainty
on the hydrogen column density
inferred assuming the power-law
spectrum interpolated from the HRs
(InterpPowNH_pos)
1535-1545 E11.5 cm-2 e_NH1H []? The 1-sigma negative uncertainty
on the hydrogen column density
inferred assuming the power-law
spectrum interpolated from the HRs
(InterpPowNH_neg)
1547-1556 E10.4 --- Gam ? The spectral photon index inferred
assuming the power-law spectrum
interpolated from the HRs
(InterpPowGamma)
1558-1568 E11.5 -- E_Gam []? The 1-sigma positive uncertainty
on the spectral photon index inferred
assuming the power-law spectrum
interpolated from the HRs
(InterpPowGamma_pos)
1570-1580 E11.5 --- e_Gam []? The 1-sigma negative uncertainty
on the spectral photon index inferred
assuming the power-law spectrum
interpolated from the HRs
(InterpPowGamma_neg)
1582-1590 E9.4 mW/m2 FIPO0 ? The mean 0.3-10 keV observed flux
assuming the power-law spectrum
interpolated from the HRs
(InterpPowFlux)
1592-1601 E10.5 mW/m2 E_FIPO0 ? The 1-sigma positive uncertainty on
the mean 0.3-10 keV observed flux
assuming the power-law spectrum
interpolated from the HRs
(InterpPowFlux_pos)
1603-1613 E11.5 mW/m2 e_FIPO0 []? The 1-sigma negative uncertainty
on the mean 0.3-10 keV observed flux
assuming the power-law spectrum
interpolated from the HRs
(InterpPowFlux_neg)
1615-1623 E9.4 mW/m2 FIPU0 ? The mean 0.3-10 keV unabsorbed flux
assuming the power-law spectrum
interpolated from the HRs
(InterpPowUnabsFlux)
1625-1634 E10.5 mW/m2 E_FIPU0 ? The 1-sigma positive uncertainty on
the mean 0.3-10 keV unabsorbed flux
assuming the power-law spectrum
interpolated from the HRs
(InterpPowUnabsFlux_pos)
1636-1646 E11.5 mW/m2 e_FIPU0 []? The 1-sigma negative uncertainty
on the mean 0.3-10 keV unabsorbed
flux assuming the power-law spectrum
interpolated from the HRs
(InterpPowUnabsFlux_neg)
--------------------------------------------------------------------------------
1648-1656 E9.4 mJ/m2/ct IPECFO ? The Energy Conversion Factor from
0.3-10 keV count-rate to 0.3-10 keV
observed flux, assuming the APEC
spectrum interpolated from the HRs
(InterpAPECECFO)
1658-1666 E9.4 mJ/m2/ct IPECFU ? The Energy Conversion Factor from
0.3-10 keV count-rate to 0.3-10 keV
unabsorbed flux, assuming the APEC
spectrum interpolated from the HRs
(InterpAPECECFU)
1668-1676 E9.4 cm-2 NH2A ? The hydrogen column density
inferred assuming the APEC spectrum
interpolated from the HRs
(InterpAPECNH)
1678-1688 E11.5 cm-2 E_NH2A []? The 1-sigma positive uncertainty
on the hydrogen column density
inferred assuming the APEC spectrum
interpolated from the HRs
(InterpAPECNH_pos)
1690-1700 E11.5 cm-2 e_NH2A []? The 1-sigma negative uncertainty
on the hydrogen column density
inferred assuming the APEC spectrum
interpolated from the HRs
(InterpAPECNH_neg)
1702-1711 E10.4 keV kTAH ? The temperature inferred assuming
the APEC spectrum interpolated from
the HRs (InterpAPECkT)
1713-1723 E11.5 keV E_kTAH []? The 1-sigma positive uncertainty
on the temperature inferred assuming
the APEC spectrum interpolated from
the HRs (InterpAPECkT_pos)
1725-1735 E11.5 keV e_kTAH []? The 1-sigma negative uncertainty
on the temperature inferred assuming
the APEC spectrum interpolated from
the HRs (InterpAPECkT_neg)
1737-1745 E9.4 mW/m2 FAIO0 ? The mean 0.3-10 keV observed flux
assuming the APEC spectrum
interpolated from the HRs
(InterpAPECFlux)
1747-1756 E10.5 mW/m2 E_FAIO0 ? The 1-sigma positive uncertainty on
the mean 0.3-10 keV observed flux
assuming the APEC spectrum
interpolated from the HRs
(InterpAPECFlux_pos)
1758-1768 E11.5 mW/m2 e_FAIO0 []? The 1-sigma negative uncertainty
on the mean 0.3-10 keV observed flux
assuming the APEC spectrum
interpolated from the HRs
(InterpAPECFlux_neg)
1770-1778 E9.4 mW/m2 FAIU0 ? The mean 0.3-10 keV unabsorbed flux
assuming the APEC spectrum
interpolated from the HRs
(InterpAPECUnabsFlux)
1780-1789 E10.5 mW/m2 E_FAIU0 ? The 1-sigma positive uncertainty on
the mean 0.3-10 keV unabsorbed flux
assuming the APEC spectrum
interpolated from the HRs
(InterpAPECUnabsFlux_pos)
1791-1801 E11.5 mW/m2 e_FAIU0 []? The 1-sigma negative uncertainty
on the mean 0.3-10 keV unabsorbed
flux assuming the APEC spectrum
interpolated from the HRs
(InterpAPECUnabsFlux_neg)
--------------------------------------------------------------------------------
1803-1806 F4.2 --- Ppow ? The probability that the HR values
of this source could be obtained if
the true spectrum is an absorbed
power-law (P_pow)
1808-1811 F4.2 --- PAPEC ? The probability that the HR values
of this source could be obtained if
the true spectrum is an APEC (P_APEC)
1813-1821 E9.4 mJ/m2/ct FPECFO ? The Energy Conversion Factor from
0.3-10 keV count-rate to 0.3-10 keV
observed flux, assuming the power-law
spectral model fitted to a
custom-built spectrum (FittedPowECFO)
1823-1832 E10.4 mJ/m2/ct FPECFU ? The Energy Conversion Factor from
0.3-10 keV count-rate to 0.3-10 keV
unabsorbed flux, assuming the
power-law spectral model fitted to a
custom-built spectrum (FittedPowECFU)
1834-1842 E9.4 cm-2 NH2C ? The hydrogen column density
inferred assuming the power-law
spectral model fitted to a
custom-built spectrum (FittedPowNH)
1844-1854 E11.5 cm-2 E_NH2C []? The 1-sigma positive uncertainty
on the hydrogen column density
inferred assuming the power-law
spectral model fitted to a
custom-built spectrum
(FittedPowNH_pos)
1856-1866 E11.5 cm-2 e_NH2C []? The 1-sigma negative uncertainty
on the hydrogen column density
inferred assuming the power-law
spectral model fitted to a
custom-built spectrum
(FittedPowNH_neg)
1868-1877 E10.4 --- Gamma ? The spectral photon index inferred
assuming the power-law spectral model
fitted to a custom-built spectrum
(FittedPowGamma)
1879-1889 E11.5 --- E_Gamma []? The 1-sigma positive uncertainty
on the spectral photon index inferred
assuming the power-law spectral model
fitted to a custom-built spectrum
(FittedPowGamma_pos)
1891-1901 E11.5 --- e_Gamma []? The 1-sigma negative uncertainty
on the spectral photon index inferred
assuming the power-law spectral model
fitted to a custom-built spectrum
(FittedPowGamma_neg)
1903-1912 E10.4 mW/m2 FPCO0 ? The mean 0.3-10 keV observed flux
assuming the power-law spectral model
fitted to a custom-built spectrum
(FittedPowFlux)
1914-1924 E11.5 mW/m2 E_FPCO0 ? The 1-sigma positive uncertainty on
the mean 0.3-10 keV observed flux
assuming the power-law spectral model
fitted to a custom-built spectrum
(FittedPowFlux_pos)
1926-1937 E12.5 mW/m2 e_FPCO0 []? The 1-sigma negative uncertainty
on the mean 0.3-10 keV observed flux
assuming the power-law spectral model
fitted to a custom-built spectrum
(FittedPowFlux_neg)
1939-1948 E10.4 mW/m2 FPCU0 ? The mean 0.3-10 keV unabsorbed flux
assuming the power-law spectral model
fitted to a custom-built spectrum
(FittedPowUnabsFlux)
1950-1960 E11.5 mW/m2 E_FPCU0 ? The 1-sigma positive uncertainty on
the mean 0.3-10 keV unabsorbed flux
assuming the power-law spectral model
fitted to a custom-built spectrum
(FittedPowUnabsFlux_pos)
1962-1973 E12.5 mW/m2 e_FPCU0 []? The 1-sigma negative uncertainty
on the mean 0.3-10 keV unabsorbed
flux assuming the power-law spectral
model fitted to a custom-built
spectrum (FittedPowUnabsFlux_neg)
1975-1981 F7.1 --- Cstat ? The C-statistic from the power-law
spectral fit to the custom-built
spectrum (FittedPowCstat)
1983-1985 I3 --- DOF ? The number of degrees of freedom in
the power-law spectral fit to the
custom-built spectrum (FittedPowDOF)
1987-1991 F5.2 --- Chi2r ? The Churazov-weighted reduced chi^2
from the power-law spectral fit to
the custom-built spectrum
(FittedPowReducedChi2)
--------------------------------------------------------------------------------
1993-2001 E9.4 mJ/m2/ct ACECFO ? The Energy Conversion Factor from
0.3-10 keV count-rate to 0.3-10 keV
observed flux, assuming the APEC
spectral model fitted to a
custom-built spectrum (FittedAPECECFO)
2003-2011 E9.4 mJ/m2/ct ACECFU ? The Energy Conversion Factor from
0.3-10 keV count-rate to 0.3-10 keV
unabsorbed flux, assuming the APEC
spectral model fitted to a
custom-built spectrum (FittedAPECECFU)
2013-2022 E10.4 cm-2 NH2AC ? The hydrogen column density
inferred assuming the APEC spectral
model fitted to a custom-built
spectrum (FittedAPECNH)
2024-2034 E11.5 cm-2 E_NH2AC []? The 1-sigma positive uncertainty
on the hydrogen column density
inferred assuming the APEC spectral
model fitted to a custom-built
spectrum (FittedAPECNH_pos)
2036-2047 E12.5 cm-2 e_NH2AC []? The 1-sigma negative uncertainty
on the hydrogen column density
inferred assuming the APEC spectral
model fitted to a custom-built
spectrum (FittedAPECNH_neg)
2049-2057 E9.4 keV kTAC ? The temperature inferred assuming
the APEC spectral model fitted to a
custom-built spectrum (FittedAPECkT)
2059-2069 E11.5 keV E_kTAC []? The 1-sigma positive uncertainty
on the temperature inferred assuming
the APEC spectral model fitted to a
custom-built spectrum
(FittedAPECkT_pos)
2071-2081 E11.5 keV e_kTAC []? The 1-sigma negative uncertainty
on the temperature inferred assuming
the APEC spectral model fitted to a
custom-built spectrum
(FittedAPECkT_neg)
2083-2092 E10.4 mW/m2 FACO0 ? The mean 0.3-10 keV observed flux
assuming the APEC spectral model
fitted to a custom-built spectrum
(FittedAPECFlux)
2094-2104 E11.5 mW/m2 E_FACO0 ? The 1-sigma positive uncertainty on
the mean 0.3-10 keV observed flux
assuming the APEC spectral model
fitted to a custom-built spectrum
(FittedAPECFlux_pos)
2106-2117 E12.5 mW/m2 e_FACO0 []? The 1-sigma negative uncertainty
on the mean 0.3-10 keV observed flux
assuming the APEC spectral model
fitted to a custom-built spectrum
(FittedAPECFlux_neg)
2119-2128 E10.4 mW/m2 FACU0 ? The mean 0.3-10 keV unabsorbed flux
assuming the APEC spectral model
fitted to a custom-built spectrum
(FittedAPECUnabsFlux)
2130-2140 E11.5 mW/m2 E_FACU0 ? The 1-sigma positive uncertainty on
the mean 0.3-10 keV unabsorbed flux
assuming the APEC spectral model
fitted to a custom-built spectrum
(FittedAPECUnabsFlux_pos)
2142-2153 E12.5 mW/m2 e_FACU0 []? The 1-sigma negative uncertainty
on the mean 0.3-10 keV unabsorbed
flux assuming the APEC spectral model
fitted to a custom-built spectrum
(FittedAPECUnabsFlux_neg)
2155-2162 F8.1 --- CstatA ? The C-statistic from the APEC
spectral fit to the custom-built
spectrum (FittedAPECCstat)
2164-2166 I3 --- DOFA ? The number of degrees of freedom in
the APEC spectral fit to the
custom-built spectrum (FittedAPECDOF)
2168-2174 F7.2 --- Chi2rA ? The Churazov-weighted reduced chi^2
from the APEC spectral fit to the
custom-built spectrum
(FittedAPECReducedChi2)
--------------------------------------------------------------------------------
2176 I1 --- HasSpec Whether a custom-built spectrum was
created for this source (HasSpec)
2178-2180 I3 --- NExt ? The number of external sources
found to agree spatially with this
one at the 3-sigma level
(NumExternalMatches)
2182-2184 I3 --- NExt2 ? The number of external sources
found to agree spatially with this
one at the 3-sigma level, excluding
2MASS and USNO-B1 matches
(NumExternalMatches_slim)
2186 I1 --- ROSHRI Whether the source is spatially
within 3 sigma of a source in the
Rosat HRI catalogue (Cat. IX/28)
(MatchInROSHRI)
2188 I1 --- 2RXS Whether the source is spatially
within 3 sigma of a source in the
2RXS catalogue (Cat. J/A+A/588/A103)
(MatchIn2RXS)
2190 I1 --- 3XMMDR8 Whether the source is spatially
within 3 sigma of a source in the
3XMM-DR8 catalogue (Cat. IX/55)
(MatchIn4XMM_DR10)
2192 I1 --- 3XMMDR7s Whether the source is spatially
within 3 sigma of a source in the
3XMM-DR7s (stacked) catalogue
(Cat. IX/56) (MatchIn4XMM_DR10s)
2194 I1 --- XMMSL2 Whether the source is spatially
within 3 sigma of a source in the
XMMSL2 catalogue (Cat. IX/53)
(MatchInXMMSL2)
2196 I1 --- SwiftFT Whether the source is spatially
within 3 sigma of a source in the
SwiftFT catalog (Cat. J/A+A/528/A122)
(MatchInSwiftFT)
2198 I1 --- 1SWXRT Whether the source is spatially
within 3 sigma of a source in the
1SWXRT catalogue (Cat. J/A+A/551/A142)
(MatchIn1SWXRT)
2200 I1 --- XRTGRB Whether the source is spatially
within 3 sigma of an XRT GRB
afterglow (MatchInXRTGRB)
2202 I1 --- SDSSQSO Whether the source is spatially
within 3 sigma of a source in the
SDSS QSO DR14 catalogue
(MatchInSDSSQSODR14)
2204 I1 --- 2MASS Whether the source is spatially
within 3 sigma of a source in the
2MASS catalogue (Cat. II/246)
(MatchIn2MASS)
2206 I1 --- USNOB1 Whether the source is spatially
within 3 sigma of a source in the
USNO-B1 catalogue (Cat. I/284)
(MatchInUSNOB1)
2208 I1 --- 2CSC Whether the source is spatially
within 3 sigma of a source in the
2CSC catalogue (MatchIn2CSC)
2210 I1 --- 2SXPS Whether the source is spatially
within 3 sigma of a source in the
2SXPS (Cat. IX/58) catalogue
(MatchIn2SXPS)
--------------------------------------------------------------------------------
Note (1): Flag is as follows:
0 = Astrometry from the Swift star trackers.
1 = Astrometry from rectification with 2MASS.
Note (2): This warning is bitwise, defined as follows:
Bit Value Description
2 4 The source position is consistent with that of a
known extended source.
3 8 The source is likely an alias of a badly-fitted
piled up source.
4 16 The source lies in a region marked as contaminated
during the visual screening.
The basic values are 0, 1, or 2, meaning Good, Reasonable or
Poor respectively Higher values mean that an extra warning is
associated with the sour.
Note (3): This is a bitwise flag with the following values:
Bit Value Description
0 1 Field contains stray light.
1 2 Field contains diffuse emission or artifacts.
2 4 Field contains stray light that could not be
adequately modelled.
3 8 Field contains a bright, piled up source which
was not properly fitted in some bands.
Note (4): If this is 0 there is no warning, otherwise there is a nearby optical
source brighter than the level at which optical loading becomes a c.
Note (5): Flag is as 1=yes, 0=no, but last upper limit unconstraining,
-1 = no, and upper limit below last detection.
Note (6): is given in the summary fields:
Value Source of spectral information
0 Fixed spectrum: power-law with Γ=1.7 and NH is GalacticNH.
1 Power-law spectral values derived from the hardness ratios.
2 Power-law spectral values taken from a fit to a custom-built
spectrum.
Note (7): is given in the summary fields:
Value Source of spectral information
0 Fixed spectrum: APEC with kT=1 keV and NH is GalacticNH.
1 APEC spectral values derived from the hardness ratios.
2 APEC spectral values taken from a fit to a custom-built
spectrum.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: datasets.dat dclean.dat duclean.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I6 --- DataID The unique identifier for this dataset
(DatasetID)
8- 18 I11 --- ObsID The identifier of the observation or
stacked image in which this detection
occurred (ObsID)
20- 22 I3 --- Version The version of this dataset
(DataVersion) (1)
24 I1 --- Stacked Whether or not this is a stacked image
(IsStackedImage)
26- 27 I2 --- FFlag The warning flag associated with this
dataset (FieldFlag) (2)
29- 37 F9.5 deg RAdeg The right ascension of the
field centre (J2000) (RA)
39- 47 F9.5 deg DEdeg The declination of the field
centre (J2000) (Decl)
49- 57 F9.5 deg GLON Galactic longitude of the field centre
(l)
59- 67 F9.5 deg GLAT Galactic latitude of the field centre
(b)
69- 72 I4 --- Size The side length of the field image in
XRT pixels (2.357 arcsec per pixel)
(ImageSize)
74- 82 F9.1 s Exp The nominal exposure in the dataset,
after all screening has been carried
out (ExposureUsed)
84-102 A19 "datime" t.start1 The UTC start time of the dataset
(StartTime_UTC)
104-122 A19 "datime" t.stop1 The UTC end time of the dataset
(StopTime_UTC)
124-132 F9.1 s OExp The original nominal exposure in the
dataset before screening
(OriginalExposure)
134-142 I9 s time.start1 The start time of the dataset, in Swift
Mission Elapsed Time (StartTime_MET)
144-152 I9 s time.stop1 The end time of the dataset, in Swift
Mission Elapsed Time (StopTime_MET)
154-162 I9 s time.mid1 The mid-time of the dataset, in Swift
Mission Elapsed Time (MidTime_MET)
164-176 F13.5 s time.mid2 The mid-time of the dataset, in
Barycentric Dynamical Time (MidTime_TDB)
178-188 F11.5 s time.mid3 The mid-time of the dataset, as a
Modified Julian Date (MidTime_MJD)
190-208 A19 "datime" LiveDate The UTC date at which this dataset
became live (LiveDate)
210-217 E8.3 ct/pix/s FBGb0 The mean background level in the
0.3-10 keV band (FieldBG_band0)
219-226 E8.3 ct/pix/s FBGb1 The mean background level in the
0.3-1 keV band (FieldBG_band1)
228-235 E8.3 ct/pix/s FBGb2 The mean background level in the
1-2 keV band (FieldBG_band2)
237-244 E8.3 ct/pix/s FBGb3 The mean background level in the
2-10 keV band (FieldBG_band3)
246-248 I3 --- Nbr0 The number of sources detected in this
dataset in the 0.3-10 keV band
(NumSrc_band0)
250-252 I3 --- NOK0 The number of good or reasonable
sources detected in this dataset in the
0.3-10 keV band (NumOK_band0)
254-260 F7.2 pc MD0 ?=9999.99 The median distance between
sources detected in this dataset in
the 0.3-10 keV band (MedianDist_band0)
262-264 I3 --- Nbr1 The number of sources detected in this
dataset in the 0.3-1 keV band
(NumSrc_band1)
266-268 I3 --- NOK1 The number of good or reasonable
sources detected in this dataset in the
0.3-1 keV band (NumOK_band1)
270-276 F7.2 pc MD1 ?=9999.99 The median distance between
sources detected in this dataset in the
0.3-1 keV band (MedianDist_band1)
278-280 I3 --- Nbr2 The number of sources detected in this
dataset in the 1-2 keV band
(NumSrc_band2)
282-284 I3 --- NOK2 The number of good or reasonable
sources detected in this dataset in the
1-2 keV band (NumOK_band2)
286-292 F7.2 pc MD2 ?=9999.99 The median distance between
sources detected in this dataset in
the 1-2 keV
band (MedianDist_band2)
294-296 I3 --- Nbr3 The number of sources detected in this
dataset in the 2-10 keV band
(NumSrc_band3)
298-300 I3 --- NOK3 The number of good or reasonable
sources detected in this dataset in the
2-10 keV band (NumOK_band3)
302-308 F7.2 pc MD3 ?=9999.99 The median distance between
sources detected in this dataset in the
2-10 keV band (MedianDist_band3)
310-313 I4 --- NSnaps The number of snapshots contributing to
this dataset (NumberOfSnapshots)
315-319 F5.2 arcsec ErrAst ? The 90% confidence radial uncertainty
on the XRT-2MASS astrometric correction
(AstromError)
321-331 F11.7 --- CRV1c ? The CRVAL1 WCS reference value for
the dataset derived from the XRT-2MASS
astrometric correction (CRVAL1_corr)
333-343 F11.7 --- CRV2c ? The CRVAL2 WCS reference value for
the dataset derived from the XRT-2MASS
astrometric correction (CRVAL2_corr)
345-354 F10.7 --- CROT2c ? The CROTA1 WCS reference value for
the dataset derived from the XRT-2MASS
astrometric correction (CROTA2_corr)
356 I1 --- Stack Whether this corresponds to a stacked
image which has been superseded by a
newer version, but which contains a
unique detection of a source
(IsObsoleteStack)
--------------------------------------------------------------------------------
Note (1): For stacked images it is the number of times the image has been
analysed with extra data. For single observations it is the number of
times the original data were processed after data downlink.
Note (2): This is a bitwise flag with the following values:
Bit Value Description
0 1 Field contains stray light.
1 2 Field contains diffuse emission or artifacts.
2 4 Field contains stray light that could not be adequately
modelled.
3 8 Field contains a bright, piled up source which was not
properly fitted in some bands.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: detect.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 7 I7 --- DetID A unique identifier for this detection
(DetectionID)
9- 14 I6 --- DataID The unique identifier for the dataset in
which the detection occurred (DatasetID)
16- 26 I11 --- ObsID The obsID of the observation in which the
detection occurred (ObsID)
28- 34 I7 --- ObsSID The ID of the obsSource this detection is
part of (ObsSourceID)
36- 42 I7 --- LSXPS ? The ID of the LSXPS source of which this
is a detection (LSXPS_ID)
44- 46 I3 --- SNo The identifier of this source within this
obsid and band (SourceNo)
48 I1 --- Band The band in which this detection occurred
(Band) (1)
50- 58 F9.1 s ExpCor The exposure time at the position of the
source in this obsID (CorrectedExposure)
60- 63 F4.2 s ExpFrac The fractional exposure at the position of
this source, i.e. the exposure divided by
the nominal exposure for the field
(ExposureFraction)
65- 69 F5.2 arcmin OffAxis The angular distance of the source from the
XRT boresight in all observations within
which the source was detected (OffaxisAngle)
71- 79 F9.5 deg RAdeg Right ascension (J2000) (RA)
81- 89 F9.7 deg E_RAdeg The 1-sigma positive uncertainty on the
right ascension (RA_pos)
92-100 F9.7 deg e_RAdeg The 1-sigma negative uncertainty on the
right ascension (RA_neg)
102-110 F9.5 deg DEdeg Declination (J2000) (Decl)
112-120 F9.7 deg E_DEdeg The 1-sigma positive uncertainty on the
declination (Decl_pos)
123-131 F9.7 deg e_DEdeg The 1-sigma negative uncertainty on the
declination (Decl_neg)
133-137 F5.1 arcsec Err90 Position uncertainty, 90% confidence,
radial, assumed to be Rayleigh-distributed
(Err90)
139-147 F9.5 deg RAcordeg ? Right Ascension corrected using XRT-2MASS
astrometry (J2000) (RA_corrected)
149-157 F9.5 deg DEcordeg ? Declination corrected using XRT-2MASS
astrometry (J2000) (Decl_corrected)
159-163 F5.1 arcsec Err90corr ? Uncertainty on the corrected position,
90% confidence, radial, assumed to be
Rayleigh-distributed (Err90_corrected)
165-173 F9.5 deg GLON Galactic longitude (l)
175-183 F9.5 deg GLAT Galactic latitude (b)
185-193 F9.5 deg GLONcor ? Galactic longitude corrected using
XRT-2MASS astrometry (l_corrected)
195-203 F9.5 deg GLATcor ? Galactic latitude corrected using
XRT-2MASS astrometry (b_corrected)
205-212 F8.3 pix X The x position of the object in the SKY
image plane (IMG_X)
214-221 F8.3 pix Y The y position of the object in the SKY
image plane (IMG_Y)
223-229 F7.2 arcsec DNN The distance to the closest detection to
this one, in this image (NearestNeighbour)
231-237 F7.2 arcsec DNNOK The distance to the closest Good or
reasonable detection to this one, in this
image (NearestOKNeighbour)
239-240 I2 --- DetFlag The best detection flag from all detections
of the source (DetFlag) (2)
242-250 F9.6 mag Warning Whether this detection is potentially
affected by optical loading
(OpticalLoadingWarning) (3)
252 I1 --- DetSLW Whether this detection occurred within
fitted stray light rings (StrayLightWarning)
254 I1 --- DetNBSW Whether this detection occurred within the
PSF wings of a fitted bright source
(NearBrightSourceWarning)
256 I1 --- MatchX Whether the position of this source matches
a known extended X-ray source
(MatchesKnownExtended)
258 I1 --- Pileup Whether the accepted fit included pile up
(PileupFitted)
260-264 F5.1 --- SNR The signal to noise ratio of the detection
(SNR)
266-272 I7 ct CtsPSF Number of counts in the image region over
which the final PSF fit was performed
(CtsInPSFFit)
274-282 E9.4 ct/s BGPSF Mean count-rate in the background map in
the region over which the final PSF fit was
performed (BGRateInPSFFit)
284-304 F21.1 --- Cstat The C-statistic value from the PSF fit
(Cstat)
306-326 F21.1 --- CstatNo The C-statistic value derived over the PSF
fit region if no source is fitted
(Cstat_nosrc)
328-331 F4.1 --- Lsrc The log-likelihood value that this
detection is not just a background
fluctuation (L_src)
333-353 F21.1 --- CstatF The Cstat value found from a fit assuming a
constant increase above the background
(i.e. the count excess is flat, not PSFlike)
(Cstat_flat)
355-358 F4.1 --- LFlat The log-likelihood value that this
detection is PSF like, not a flat count
increase (Lflat)
360-363 F4.2 --- FracPix The fraction of pixels within the PSF fit
region which are exposed (FracPix)
365-369 F5.2 --- PileS The best-fitting S parameter of the pile-up
model, if fitted (Pileup_S)
371-375 F5.2 --- Pilel The best-fitting l parameter of the pile-up
model, if fitted (Pileup_l)
377-381 F5.2 --- Pilec The best-fitting c parameter of the pile-up
model, if fitted (Pileup_c)
383-388 F6.2 --- Piletau The best-fitting tau parameter of the
pile-up model, if fitted (Pileup_tau)
390-430 F41.1 --- CstatPile The Cstat value found from the unusued fit
i.e. if the piled up model was used, this
gives the Cstat from the non-piled-up fit,
and vice-versa (Cstat_altPileup)
432-433 I2 --- PSFRad The radius of the circular region over
which PSF fitting was carried out
(in image pixels, 2.357"" to a side)
(PSFFitRadius)
435-436 I2 --- BoxWidth The full width of the cell-detect box in
which this source was detected
(in image pixels, 2.357"" to a side)
(CellDetect_BoxWidth)
438-447 E10.4 ct/s Rate The corrected count-rate of this detection
(i.e. in the band of this image) (Rate)
449-458 E10.4 ct/s E_Rate The 1-sigma positive uncertainty on the
count rate (Rate_pos)
460-469 E10.4 ct/s e_Rate The 1-sigma negative uncertainty on the
count rate (Rate_neg)
471-477 I7 ct Cts The total number of counts in the region
used to extract the count rate (CtsInRate)
479-487 E9.4 ct BGCts The total number of counts in the region
used to extract the count rate (BGCtsInRate)
489-498 F10.2 --- CF The PSF correction factor for the count
rate (Rate_CF)
500-508 E9.4 ct/s BGRate The background rate in the region used for
count-rate calculation (BGRateInRate)
--------------------------------------------------------------------------------
Note (1): As an integer:
Value Band name Energy range
0 Total 0.3-10 keV
1 Soft 0.3-1 keV
2 Medium 1-2 keV
3 Hard 2-10 keV
Note (2): The basic values are 0, 1, or 2, meaning Good, Reasonable or Poor
respectively. Higher values mean that an extra warning is associated
with the source. This warning is bitwise, defined as follows :
Bit Value Description
2 4 The source position is consistent with that of a known
extended source.
3 8 The source is likely an alias of a badly-fitted
piled up source.
4 16 The source lies in a region marked as contaminated
during the visual screening.
Note (3): If this is 0 there is no catalogue bright optical source nearby,
otherwise there is a nearby optical source brighter than the level at
which optical loading becomes a concern; the value indicates how many
magnitudes brighter than that level the source is.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: obsource.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 I11 --- ObsSID The unique identifier of this ObsSource
(ObsSourceID)
13- 18 I6 --- DataID The dataset identifier in which this obsSource
was found (DatasetID)
20- 26 I7 --- LSXPS ? Numerical unique source identifier within
LSXPS (LSXPS_ID) ?
28- 30 I3 --- OSNum The identifier of this obsSource within this
dataset (OSNum)
32 I1 --- CorPos Whether or not the astrometrically-corrected
position of this obsSource should be used
(UsedCorrectedPosition)
34- 40 F7.2 arcsec DNN ?=9999.99 The distance (in arcseconds) to
the closest LSXPS obsSource within this
dataset (NearestNeighbour)
42- 48 F7.2 arcsec DNNOK ?=9999.99 The distance (in
arcseconds) to the closest good or reasonable
LSXPS obsSource within this dataset
(NearestOKNeighbour)
50- 56 I7 s Exp The exposure time at the position of the
obsSource, corrected for vignetting (Exposure)
58- 63 F6.3 --- HR1 ? The aggregate HR1 hardness ratio of the
obsSource (HR1)
65- 73 F9.4 --- E_HR1 ? The 1-sigma positive uncertainty on the
aggregate HR1 hardness ratio of the obsSource
(HR1_pos)
75- 84 F10.4 --- e_HR1 ? The 1-sigma negative uncertainty on the
aggregate HR1 hardness ratio of the obsSource
(HR1_neg)
86- 91 F6.3 --- HR2 ? The aggregate HR2 hardness ratio of the
obsSource (HR2)
93-111 F19.4 --- E_HR2 ? The 1-sigma positive uncertainty on the
aggregate HR2 hardness ratio of the obsSource
(HR2_pos)
113-132 F20.4 --- e_HR2 ? HR2_neg The 1-sigma negative uncertainty on
the aggregate HR2 hardness ratio of the
obsSource (HR2_neg)
134 I1 --- BBand The energy band corresponding to the best
detection of this obsSource in this dataset
(BestBand)
136-137 I2 --- Pile ? Whether a pileup warning exists, indicating
that the object is very piled up and in some
bands there is evidence of pile up not being
fitted (PileupWarning)
139-145 I7 --- DetID The DetectionID of the best detection of this
obsSource in this dataset (BestDetectionID)
147 I1 --- Orphan Whether this source is one which is only
detected in this dataset, and this dataset is
deprecated (IsOrphanSource)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: xcorr.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 7 I7 --- LSXPS The numerical identifier of the LSXPS source
(LSXPS_ID)
9- 33 A25 --- ExtCat The catalogued name of the external source
(ExtCat_ID)
35- 47 A13 --- Cat The catalogue in which the external source
was found (Catalogue)
49- 54 F6.2 arcsec D The distance between the 2SXPS and external
source positions (Distance)
56- 64 F9.5 deg ExtRAdeg The right ascension of the external source
(J2000) (Ext_RA)
66- 74 F9.5 deg ExtDEdeg The declination of the external source
(J2000) (Ext_Decl)
76- 80 F5.1 arcsec ExtErr90 ? The 90% confidence radial position error
of the external source (Ext_Err90) (1)
--------------------------------------------------------------------------------
Note (1): Used for cross correlation. This may have been converted to 90%
(assuming Rayleigh statistics) and had a systematic error added
if necessary, therefore may differ from the catalogued value.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: oldstack.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I6 --- DataID The unique identifier for this dataset
(DatasetID)
8- 10 I3 --- DataV The version of this dataset (DataVersion)
(1)
12- 30 A19 "datime" LiveDate The UTC date at which this dataset became
live (LiveDate)
32- 42 I11 --- ObsID The identifier of the observation or stacked
image in which this detection occurred
(ObsID)
44 I1 --- Obsolete Whether this corresponds to a stacked image
which has been superseded by a newer
version, but which contains a unique
detection of a source (IsObsoleteStack)
--------------------------------------------------------------------------------
Note (1): For stacked images it is the number of times the image has been
analysed with extra data; for single observations it is the
number of times the original data were processed after data
downlink.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: trans.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 --- TrsID A unique numerical identifier for this
transient within this catalogue
(TransientID)
7- 28 A22 --- IAUName The IAU-format name of the transient:
SwiftJ HHMMSS.S+ddmmss (IAUName)
30- 36 I7 --- LSXPS ? The source identifier within the main
LSXPS catalogue (LSXPS_ID)
38- 59 A22 --- LSXPSN The IAU name of this object in the main
LSXPS catalogue (LSXPSName)
61 I1 --- Class A numerical code describing how this
transient has been classified e.g 64
cases of 1 as confirmed transient
(Classification)
63- 71 F9.5 deg RAdeg Right ascension (J2000) (RA)
73- 81 F9.5 deg DEdeg Declination (J2000) (Decl)
83- 86 F4.1 arcsec Err90 Position uncertainty, 90% confidence,
radial, assumed to be
Rayleigh-distributed (Err90)
88- 96 F9.5 deg GLON Galactic longitude (l)
98-106 F9.5 deg GLAT Galactic latitude (b)
108-113 I6 --- Discovery The date of the observation in ident
number in which the transient was first
found (DiscoveryDatasetID)
115-121 I7 --- ObsSID The numerical identified of the first
detection in the Public_ObsSources
table (ObsSourceID)
123-131 E9.4 ct/s PRate The peak count-rate in the 0.3-10 keV
band in the dataset in which the
transient was first detected
(PeakRateAtDetection)
133-141 E9.4 ct/s E_PRate The 1-sigma positive uncertainty on the
peak count-rate in the 0.3-10 keV band
in the dataset in which the transient
was first detected
(PeakRateAtDetection_pos)
143-152 E10.4 ct/s e_PRate The 1-sigma negative uncertainty on the
peak count-rate in the 0.3-10 keV band
in the dataset in which the transient
was first detected
(PeakRateAtDetection_neg)
154-162 E9.4 ct/s PSMRate The peak count-rate in the 0.3-2 keV
band in the dataset in which the
transient was first detected
(PeakSoftMedBandRateAtDetection)
164-176 A13 --- UpperC Where the 'best' upper limit at the
source location was taken from, where
the 'canned' spectrum is used to
convert between observatories
(UpperLimitSource_Canned)
178-190 A13 --- UpperDS Where the 'best' upper limit at the
source location was taken from, where
the discovery spectrum is used to
convert between observatories
(UpperLimitSource_DS)
192-204 A13 --- UpperFS Where the 'best' upper limit at the
source location was taken from, where
the full spectrum is used to convert
between observatories
(UpperLimitSource_FS)
206-209 F4.1 --- Sig How far above the best upper limit the
peak count rate is, in Gaussian sigmas
(Significance)
211-219 E9.4 cm-2 NH ? The hydrogen column density found in
an automated power-law fit to a spectrum
built from the discovery dataset
(InitSpecNH)
221-231 E11.5 --- Gamma ? The photon index found in an automated
power-law fit to a spectrum built from
the discovery dataset (InitSpecGamma)
233-237 F5.1 --- Cstat ? The C-statistic from an automated
power-law fit to a spectrum built from
the discovery dataset. (InitSpecCstat)
239-244 F6.2 --- Chi2 ? The Churazov-weighted reduced chi^2
from an automated power-law fit to a
spectrum built from the discovery
dataset (InitSpecTestStat)
246-248 I3 --- Dof ? The number of degrees of freedom in
the automated power-law fit to a
spectrum built from the discovery
dataset (InitSpecDof)
250-258 E9.4 cm-2 NHFS ? The hydrogen column density found in
an automated power-law fit to a
spectrum built from all observations of
the transient after its discovery
(FullSpecNH)
260-270 E11.5 --- GammaFS ? The photon index found in an
automated power-law fit to a spectrum
built from all observations of the
transient after its discovery
(FullSpecGamma)
272-276 F5.1 --- CstatFS ? The C-statistic from an automated
power-law fit to a spectrum built from
all observations of the transient after
its discovery (FullSpecCstat)
278-283 F6.2 --- Chi2FS ? The Churazov-weighted reduced chi^2
from an automated power-law fit to a
spectrum built from all observations of
the transient after its discovery
(FullSpecTestStat)
285-287 I3 --- DofFS ? The number of degrees of freedom in
the automated power-law fit to a
spectrum built from the all
observations of the transient after its
discovery (FullSpecDof)
289-307 A19 "datime" DiscDate ? The date of the analysis in which the
transient was first found
(DiscoveryDate)
309-312 I4 yr DetDate ? The date of the start of the
observation in which the transient was
first found (DetectionDate)
314-329 F16.6 s DetMET The MET of the start of the observation
in which the transient was first found
(DetectionMET)
331-339 E9.4 ct/s LSXPSul ? An upper limit at the transient
derived from the LSXPS catalogue
(LSXPS_UpperLimit)
341-349 E9.4 --- LSXPSulID ? The observation in the LSXPS
catalogue from which the upper limit
was derived (LSXPSUpperLimitObsID)
351-359 E9.4 ct/s XMMul ? An XMM-Newton upper limit at the
transient location, obtained via the
HILIGT server, in native XMM count-rate
units (XMMUpperLimitnative)
361-367 A7 --- XMMulMode The mode in which XMM was observing
when the upper limit was obtained
(XMMUpperLimitObsMode)
369-377 A9 --- XMMulInst The XMM-Newton instrument from which
the upper limit was obtained
(XMMUpperLimitInstrument)
379-387 E9.4 ct/s XMMulXRTds ? The XMM-Newton upper limit converted
to a 0.3-10 keV XRT count rate, using
the automated power-law fit to a spec.
built from the discovery dataset
(XMMUpperLimitasXRTTotal_DS)
389-397 E9.4 ct/s XMMulXRTfs ? The XMM-Newton upper limit converted
to a 0.3-10 keV XRT count rate, using
the automated power-law fit to a spect.
built from the all obs. of the transient
after its discovery (XMMULasXRTTot_FS)
399-407 E9.4 ct/s XMMulXRTc ? The XMM-Newton upper limit converted
to a 0.3-10 keV XRT count rate, using a
standard AGN spectrum
(XMMUpperLimitasXRTTotal_Canned)
409-417 E9.4 ct/s RSul An ROSAT All-Sky Survey upper limit at
the transient location, obtained via
the HILIGT server, in native ROSAT PSPC
count-rate units (RASSUpperLimnative)
419-427 E9.4 ct/s RSulXRTsmds ? The RASS upper limit converted to a
0.3-2 keV XRT count rate, using the
automated power-law fit to a spectrum
built from the discovery dataset
(RASSUpperLimitasXRTSoftMed_DS)
429-437 E9.4 ct/s RSulXRTsmfs ? The RASS upper limit converted to a
0.3-2 keV XRT count rate, using the
automated power-law fit to a spectrum
built from the all observations of the
transient after its discovery
(RASSUpperLimitasXRTSoftMed_FS)
439-447 E9.4 ct/s RSulXRTsmc The RASS upper limit converted to a
0.3-2 keV XRT count rate, using a
standard AGN spectrum
(RASSUpperLimitasXRTSoftMed_Canned)
449-457 E9.4 ct/s RSulXRTds ? The RASS upper limit converted to a
0.3-10 keV XRT count rate, using the
automated power-law fit to a spectrum
built from the discovery dataset
(RASSUpperLimitasXRTTotal _DS)
459-467 E9.4 ct/s RSulXRTfs ? The RASS upper limit converted to a
0.3-10 keV XRT count rate, using the
automated power-law fit to a spectrum
built from the all observations of the
transient after its discovery
(RASSUpperLimitasXRTTotal_FS)
469-477 E9.4 ct/s RSulXRTc ? The RASS upper limit converted to a
0.3-10 keV XRT count rate, using a
standard AGN spectrum
(RASSUpperLimitasXRTTotal_Canned)
479-635 A157 --- Notes Any notes added by the XRT team (Notes)
--------------------------------------------------------------------------------
Acknowledgements:
Philip A. Evans, pae9(at)leicester.ac.uk
History:
From electronic version of the journal
(End) Luc Trabelsi [CDS] 19-Nov-2025