J/A+A/551/A142 7 year Swift-XRT point source catalog (1SWXRT) (D'Elia+, 2013)
The seven year Swift-XRT point source catalog (1SWXRT).
D'Elia V., Perri M., Puccetti S., Capalbi M., Giommi P., Burrows D.N.,
Campana S., Tagliaferri G., Cusumano G., Evans P., Gehrels N., Kennea J.,
Moretti A., Nousek J.A., Osborne J.P., Romano P., Stratta G.
<Astron. Astrophys. 551, A142 (2013)>
=2013A&A...551A.142D 2013A&A...551A.142D
ADC_Keywords: Surveys ; X-ray sources ; Gamma rays
Mission_Name: Swift
Keywords: catalogs - surveys - X-rays: general
Abstract:
The Swift satellite is a multi-wavelength observatory specifically
designed for gamma-ray burst (GRB) astronomy that is operational since
2004. Swift is also a very flexible multi-purpose facility that
supports a wide range of scientific fields such as active galactic
nuclei, supernovae, cataclysmic variables, Galactic transients, active
stars and comets. The Swift X-ray Telescope (XRT) has collected more
than 150Ms of observations in its first seven years of operations.
The purpose of this work is to present to the scientific community the
list of all the X-ray point sources detected in XRT imaging data taken
in photon counting mode during the first seven years of Swift
operations. All these point-like sources, excluding the Gamma-Ray
Bursts (GRB), will be stored in a catalog publicly available (1SWXRT).
We consider all the XRT observations with exposure time longer than
500 s taken in the period 2005-2011. Data were reduced and analyzed
with standard techniques and a list of detected sources for each
observation was produced. A careful visual inspection was performed to
remove extended, spurious and piled-up sources. Finally, positions,
count rates, fluxes and the corresponding uncertainties were
computed.
Description:
The Table contains the 1SWXRT catalog of the serendipitous sources
detected in 7 years of Swift-XRT observations, acquired between 2005
and 2011 and with exposure time longer than 500 seconds.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
1swxrt.dat 580 84979 1SWXRT catalog of the serendipitous sources
detected in 7 years of Swift-XRT observations
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See also:
J/A+A/448/L9 : Position catalogue of Swift XRT afterglows (Moretti+, 2006)
J/MNRAS/397/1177 : Swift-XRT observations of GRBs (Evans+, 2009)
J/MNRAS/403/945 : Swift/XRT obs. of unidentified IBIS sources (Landi+, 2010)
J/A+A/528/A122 : SwiftFT catalog (Puccetti+, 2011)
Byte-by-byte Description of file: 1swxrt.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- --- [1SWXRT]
8- 23 A16 --- 1SWXRT 1SWXRT source name (JHHMMSS.s+DDMMSS)
25- 43 A19 --- Target XRT field name
45- 56 F12.8 deg RAdeg Swift-XRT Right Ascension (J2000)
58- 68 F11.7 deg DEdeg Swift-XRT Declination (J2000)
70- 80 I011 --- Seq Swift-XRT observation number
82- 91 A10 "YYYY-DD-MM" Beg.date Start date of the field observations
93-100 A8 "h:m:s" Beg.time Start time of the field observations
102-111 A10 "YYYY-DD-MM" End.date End date of the field observations
113-120 A8 "h:m:s" End.time End time of the field observations
122-140 E19.13 ct/s Fcrate ?=-99. 0.3-10keV count rate or
90% upper limit
142-160 E19.13 ct/s e_Fcrate ?=-99. 1σ 0.3-10keV count rate error
(set to -99 in case of upper limit)
162-179 E18.13 mW/m2 FFlux 0.5-10keV Flux or 90% upper limit
181-199 E19.13 mW/m2 e_FFlux ?=-99. 1σ 0.5-10keV Flux error
(set to -99 in case of upper limit)
201-217 E17.13 --- Fprob 0.3-10keV false detection probability
219-232 F14.10 --- FSNR 0.3-10keV Signal-to-noise ratio, S/N
234-252 E19.14 ct/s Scrate ?=-99. 0.3-3keV count rate or
90% upper limit
254-272 E19.14 ct/s e_Scrate ?=-99. 1σ 0.3-3keV count rate error
(set to -99 in case of upper limit)
274-290 E17.13 mW/m2 SFlux 0.5-2keV Flux or 90% upper limit
292-308 E17.14 mW/m2 e_SFlux ?=-99. 1σ 0.5-2keV Flux error
(set to -99 in case of upper limit)
310-326 E17.12 --- Sprob 0.3-13keV false detection probability
328-343 F16.10 --- SSNR 0.3-13keV Signal-to-noise ratio, S/N
345-361 E17.12 ct/s Hcrate 2-10keV count rate or 90% upper limit
363-379 E17.14 ct/s e_Hcrate ?=-99. 1σ 2-10keV count rate
(set to -99 in case of upper limit)
381-397 E17.12 mW/m2 HFlux 2-10keV Flux or 90% upper limit
399-415 E17.14 mW/m2 e_HFlux ?=-99. 1σ 2-10keV Flux error
(set to -99 in case of upper limit)
417-433 E17.12 --- Hprob 2-10keV false detection probability
435-450 F16.10 --- HSNR 2-10keV Signal-to-noise ratio, S/N
452-466 F15.9 s Texp Total on-time
468-486 E19.14 --- HR [-1/1]?=-99. Hardness ratio (2) (1)
488-506 E19.14 --- e_HR ?=-99. 1σ hardness ratio error (3)
508-523 E16.10 arcsec ePos Positional error at 68 % confidence level
525-541 E17.12 cm-2 NH Galactic hydrogen column density
543-561 E19.12 --- beta ?=-99 Energy spectral index
β=Γ-1 (2)
563-580 E18.14 --- e_beta ?=0 Energy spectral index error
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Note (1): HR=(Hcrate-Scrate)/(Hcrate+Scrate)
Note (2): set to -99 if soft or hard counts are missing
Note (3): evaluated with the error propagation formula (see e.g. Bevington
and Robinson 1992, Data Reduction and Error Analysis for the Physical
Sciences (the McGraw-Hill Companies, Inc.)
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Acknowledgements:
Valerio D'Elia, valerio.delia(at)asdc.asi.it
(End) Patricia Vannier [CDS] 17-Jan-2013