J/ApJS/268/41 The GALEX Flare Catalog (GFCAT) (Million+, 2023)
The GFCAT: a catalog of ultraviolet variables observed by GALEX with subminute
resolution.
Million C.C., Clair M.S., Fleming S.W., Bianchi L., Osten R.
<Astrophys. J. Suppl. Ser., 268, 41 (2023)>
=2023ApJS..268...41M 2023ApJS..268...41M
ADC_Keywords: Photometry, ultraviolet; Stars, flare; Proper motions; Optical;
Stars, variable
Keywords: Ultraviolet astronomy ; Time domain astronomy ; Flare stars ;
Eclipsing binary stars ; RR Lyrae variable stars ;
Delta Scuti variable stars ; Catalogs ; Active galactic nuclei ;
Space telescopes ; Astronomy software
Abstract:
We have performed the first systematic search of the full Galaxy
Evolution Explorer (GALEX) data archive for astrophysical variability
on timescales of seconds to minutes by rebinning data across the whole
mission to 30s time resolution. The result is the GALEX Flare Catalog
(GFCAT), which describes 1426 ultraviolet variable sources, including
stellar flares, eclipsing binaries, δ Scuti and RR Lyrae
variables, and active galactic nuclei. Many of these sources have
never previously been identified as variable. We have also assembled a
table of observations of ultraviolet flares and accompanying
statistics and measurements, including energies, and of candidate
eclipsing stars. This effort was enabled by a significantly enhanced
version of the gPhoton software for analyzing time-domain GALEX data;
this "gPhoton2" package is available to support follow-on efforts.
Description:
Our initial sample of data included all GALEX visits through the end
of NASA support for the mission (GALEX eclipse number 46832).
See Section 2.
The GALEX Flare Catalog (GFCAT) contains 1959 measurements of
intravisit variability across 1426 unique sources. Of these, 588 have
not previously been described as variable.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 164 1426 GFCAT object catalog
table2.dat 922 1959 GFCAT visit catalog
table3.dat 1279 1128 GFCAT flare catalog
table4.dat 934 73 Candidate GALEX visits that may contain
stellar eclipses
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See also:
III/257 : RAVE second data release (Zwitter+, 2008)
II/335 : Revised cat. of GALEX UV sources (GUVcat_AIS GR6+7) (Bianchi+ 2017)
I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)
J/AJ/130/825 : GALEX ultraviolet variability catalog (Welsh+, 2005)
J/ApJS/173/673 : M dwarf UV flares in GALEX (Welsh+, 2007)
J/AJ/136/259 : 2nd GALEX UV variability catalog (GUVV-2) (Wheatley+, 2008)
J/AJ/142/138 : All-sky catalog of bright M dwarfs (Lepine+, 2011)
J/ApJ/766/60 : GALEX Time Domain Survey I. UV var. sources (Gezari+, 2013)
J/AJ/148/64 : HAZMAT. I. UV emission in early M stars (Shkolnik+, 2014)
J/MNRAS/447/2714 : Flare stars across the H-R diagram (Balona+, 2015)
J/ApJ/813/100 : Deep GALEX NUV survey of Kepler field. I. (Olmedo+, 2015)
J/ApJ/817/1 : Palomar/MSU and SDSS M dwarfs with GALEX obs. (Jones+, 2016)
J/ApJ/845/171 : Rapidly pulsating sdB stars with GALEX (Boudreaux+, 2017)
J/AJ/154/67 : HAZMAT. II. Low-mass stars with GALEX UV obs. (Miles+, 2017)
J/ApJS/238/25 : UV var. with GALEX gPhoton archive. I. (de la Vega+, 2018)
J/MNRAS/490/2112 : Rotational frequencies in A and B stars (Balona, 2019)
J/ApJ/883/88 : Stellar flares from GALEX & Kepler (Brasseur+, 2019)
J/ApJ/881/9 : EvryFlare. I. Stars's flares in southern sky (Howard+, 2019)
J/MNRAS/486/4574 : 62 new variable white dwarfs from GALEX (Rowan+, 2019)
J/MNRAS/489/5046 : GALEX absolute calibration based on WDs (Wall+, 2019)
J/ApJ/926/204 : TESS campaign of low-mass flare stars (Howard+, 2022)
http://www.galex.caltech.edu/ : GALEX home page
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 A5 --- --- [GFCAT]
7- 24 A18 --- GFCAT GFCAT object identifier (JHHMMSS.s+DDMMSS.s)
26- 35 F10.6 deg RAdeg Right Ascension in decimal degrees (J2000)
37- 46 F10.6 deg DEdeg Declination in decimal degrees (J2000)
48- 49 I2 --- Nvis [1/39] Number of visits in GFCAT
51- 94 A44 --- SName Simbad identifier of nearest source
96-147 A52 --- OType Unique Simbad object types of all sources
with 17.5"
149-157 F9.6 arcsec SepS [0.1/35]? Angular offset between nearest
Simbad source and target source
159-160 I2 --- Nsim [0/31] Number of Simbad sources within 17.5"
of target source
162-164 I3 --- Nobs [1/287] Number of GALEX GR7 MIS-like observations
of target source
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 --- ObsID [927/46832] GALEX observation eclipse
number (1)
7- 17 I11 --- Index [39121378/99999945629]? GFCAT
photometric object index
19- 28 F10.6 deg RAdeg Right Ascension (J2000)
30- 39 F10.6 deg DEdeg Declination (J2000)
41- 42 I2 --- Nsim [0/31] Number of Simbad sources within
17.5"
44- 95 A52 --- OType Simbad object type of all sources
within 17.5"
97- 130 A34 --- SName Simbad identifier (2)
132- 144 F13.6 pc DistS [2.6/526316]? Simbad-provided
astrophysical distance (2)
146- 158 F13.6 pc e_DistS [0.0019/517976]? Lower uncertainty in
DistS (2)
160- 173 F14.6 pc E_DistS [-766196/774187]? Upper uncertainty in
DistS (2)
175- 182 F8.4 mas plxS [0.0019/374]? Simbad-provided parallax
(2)
184- 190 F7.4 mas e_plxS [0.0097/12.1]? Uncertainty in plxS (2)
192- 200 F9.6 arcsec SepS [0.12/35]? Angular offset between
target and closest Simbad source
202- 211 I10 s GTime [741051678/1012641170] Observation
start time in GALEX mission time units
213- 222 A10 "Y/M/D" St.date Observation start date in ISO 8601
format; UTC
223 A1 --- --- [T]
224- 231 A8 "h:m:s" St.time Observation start time in ISO 8601
format; UTC
233- 243 F11.6 yr Start [2003.49/2012.11] Observation start
time in decimal year
245- 253 F9.6 arcsec SepG [0.16/69]? Offset between target and
closest Gaia source
255- 256 I2 --- Ngaia [0/12] Number of Gaia sources with
17.5"
258- 278 E21.15 --- GaiaDR3 ? Gaia DR3 source identifier (2)
280- 292 F13.6 pc DistG [-62111/539422]? Gaia DR3 distance,
(inverted parallax) (2)
294- 307 F14.6 pc e_DistG [-224911/531076]? Lower uncertainty in
DistG
309- 322 F14.6 pc E_DistG [-731539/754043]? Upper uncertainty in
Distg
324- 333 F10.6 mas plxG [-3.1/416]? Gaia DR3 parallax (2)
335- 342 F8.6 mas e_plxG [0.009/2.3]? Uncertainty in plxG
344- 354 F11.6 --- Ratio [-2.84/6073]? Ratio of Gaia error to
target parallax
356- 367 F12.6 mas/yr pmRA [-3867/3386]? Gaia DR3 proper motion
along RA
369- 380 F12.6 mas/yr pmDE [-2700/585]? Gaia DR3 proper motion
along DE
382- 391 F10.6 deg RAGdeg ? Gaia DR3 Right Ascension (J2000)
393- 402 F10.6 deg DEGdeg ? Gaia DR3 Declination (J2000)
404- 416 F13.6 pc Dist [-62111/539422]? Best available source
distance (3)
418- 431 F14.6 pc e_Dist [-731539/754043]? Lower uncertainty in
Dist
433- 446 F14.6 pc E_Dist [-224911/531076]? Upper uncertainty in
Dist
448- 457 F10.6 ct/s CRNUVmin [0.005/675]? Minimum NUV lightcurve
count rate
459- 467 F9.6 ct/s e_CRNUVmin [0.07/14]? Uncertainty in CRNUVmin
469- 477 F9.6 mag NUVmagmin [13/26]? Minimum NUV AB magnitude
479- 486 F8.6 mag e_NUVmagmin [0.008/3]? Uncertainty in NUVmagmin
488- 498 F11.6 ct/s CRNUVmax [1.3/1612]? Maximum NUV lightcurve
count rate
500- 507 F8.6 ct/s e_CRNUVmax [0.2/8.5]? Uncertainty in CRNUVmax
509- 517 F9.6 mag NUVmagmax [12/19.8]? Maximum NUV AB magnitude
519- 526 F8.6 mag e_NUVmagmax [0.005/0.6]? Uncertainty in NUVmagmax
528- 537 F10.6 ct/s CRNUV [0.88/701]? Mean NUV lightcurve count
rate
539- 546 F8.6 ct/s e_CRNUV [0.02/0.8]? Uncertainty in CRNUV
548- 556 F9.6 mag NUVmag [12.9/20.3]? Mean NUV lightcurve AB
magnitude
558- 565 F8.6 mag e_NUVmag [0.001/0.05]? Uncertainty in NUVmag
567- 578 F12.1 s startNUV ? NUV start time; GALEX time scale (G1)
580- 591 F12.1 s stopNUV ? NUV stop time; GALEX time scale (G1)
593- 598 F6.1 s expNUV [480/1710]? Raw NUV exposure time (4)
600- 608 F9.6 ct/s CRFUVmin [0/46.6]? Minimum FUV lightcurve count
rate
610- 617 F8.6 ct/s e_CRFUVmin [0/2.4]? Uncertainty in CRFUVmin
619- 627 F9.6 mag FUVmagmin [14.6/33.3]? Minimum FUV AB magnitude
629- 636 F8.6 mag e_FUVmagmin [0.028/5.5]? Uncertainty in FUVmagmin
638- 647 F10.6 ct/s CRFUVmax [0.18/501]? Maximum FUV lightcurve
count rate
649- 656 F8.6 ct/s e_CRFUVmax [0.079/4.2]? Uncertainty in CRFUVmax
658- 666 F9.6 mag FUVmagmax [12/20.7]? Maximum FUV AB magnitude
668- 675 F8.6 mag e_FUVmagmax [0.0088/0.8]? Uncertainty in FUVmagmax
677- 686 F10.6 ct/s CRFUV [0.08/122]? Mean FUV lightcurve count
rate
688- 695 F8.6 ct/s e_CRFUV [0.007/0.4]? Uncertainty in CRFUV
697- 705 F9.6 mag FUVmag [13.6/21.5]? Mean FUV lightcurve AB
magnitude
707- 714 F8.6 mag e_FUVmag [0.002/0.2]? Uncertainty in FUVmag
716- 724 I9 s startFUV ? FUV start time; GALEX time scale (G1)
726- 734 I9 s stopFUV ? FUV stop time; GALEX time scale (G1)
736- 739 I4 s exptFUV [150/1710]? Raw FUV exposure time (4)
741- 748 F8.6 --- ratiomin [2e-06/2.7]? Minimum FUV/NUV lightcurve
flux ratio
750- 757 F8.6 --- e_ratiomin [0.0002/0.6]? Uncertainty in ratiomin
759- 767 F9.6 --- ratiomax [0.019/49]? Maximum FUV/NUV lightcurve
flux ratio
769- 777 F9.6 --- e_ratiomax [0.0049/11]? Uncertainty in ratiomax
779- 787 F9.6 --- rationuvmax [0/42]? FUV/NUV flux ratio at maximum
NUV flux
789- 796 F8.6 --- e_rationuvmax [0.004/8]? Uncertainty in rationuvmax
798- 808 F11.6 s effexpNUV [436/1572]? Integrated effective NUV
exposure time (5)
810- 821 F12.6 ct/s CRskyNUV [477.7/95982]? Estimated sky background
count rate in NUV aperture (6)
823- 832 F10.6 ct/s e_CRskyNUV [15.6/222]? Uncertainty in CRskyNUV
834- 836 F3.1 cW/m2/nm FskyNUV [0]? Estimated sky background flux in
NUV aperture; erg/s/cm2/A
(always "0.0") (6)
838- 840 F3.1 cW/m2/nm e_FskyNUV [0]? Uncertainty in FskyNUV
(always "0.0")
842- 852 F11.6 s effexpFUV [153.9/1696]? Integrated effective FUV
exposure time (5)
854- 864 F11.6 ct/s CRskyFUV [20.4/2050]? Estimated sky background
count rate in FUV aperture (6)
866- 874 F9.6 ct/s e_CRskyFUV [3.2/32.4]? Uncertainty in CRskyFUV
876- 878 F3.1 cW/m2/nm FskyFUV [0]? Estimated sky background flux in
FUV aperture; erg/s/cm2/A
(always "0.0") (6)
880- 882 F3.1 cW/m2/nm e_FskyFUV [0]? Uncertainty in FskyFUV
(always "0.0")
884 A1 --- Morph Manually-determined light curve
morphology flag (7)
886 I1 --- QANUV [0/1] Manually-determined data QA flag
for NUV (0=nominal; 1=off-nominal)
888 I1 --- QAFUV [0/1] Manually-determined data QA flag
for FUV (0=nominal; 1=off-nominal)
890- 894 A5 --- --- [GFCAT]
896- 913 A18 --- GFCAT GFCAT object identifier
(JHHMMSS.s+DDMMSS.s)
915- 922 F8.6 mag magdiff [0.06/7.4]? Range of mags in this visit
aka delta-mag
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Note (G1): Some time values are in "GALEX Time" scale. This is equivalent to
UNIX Time minus 315964800, in seconds
(i.e. GALEX TIME = UNIX TIME - 315964800).
Note (1): Approximately equivalent to a mission orbit counter.
Note (2): Of closest source to target position.
Note (3): This uses the Gaia distance if available, failing back to the
SIMBAD provided distance, or none.
Note (4): The difference between the observation start and end times.
Not adjusted for detector dead time effects or data dropouts.
Note (5): Corrected for dead time effects.
Note (6): Computed by rescaling flux measurement from the annulus.
Note (7): Morphology flag as follows:
F = Flare (1042 occurrences);
E = Eclipse (73 occurrences).
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 --- ObsID [1413/46828] GALEX observation
eclipse number
7- 17 I11 --- Index [42723102/99999945629]? GFCAT
photometric object index (1)
19- 28 F10.6 deg RAdeg Right Ascension (J2000)
30- 39 F10.6 deg DEdeg Declination (J2000)
41- 42 I2 --- Nsim [0/31] Number of Simbad sources
within 17.5"
44- 95 A52 --- OType Simbad object type of all sources
within 17.5"
97- 129 A33 --- SName Simbad identifier (2)
131- 142 F12.6 pc DistS [2.6/27549]? Simbad-provided
astrophysical distance (2)
144- 155 F12.6 pc e_DistS [0.0019/20723]? Lower uncertainty
in DistS (2)
157- 169 F13.6 pc E_DistS [-45960/459174]? Upper uncertainty
in DistS (2)
171- 178 F8.4 mas plxS [0.036/374]? Simbad-provided
parallax (2)
180- 186 F7.4 mas e_plxS [0.009/12.1]? Uncertainty in plxS
(2)
188- 196 F9.6 arcsec SepS [0.2/35]? Angular offset between
target and closest Simbad source
198- 209 F12.1 s GTime [743928009/1012618574] Observation
start time in GALEX mission time
units
211- 220 A10 "Y/M/D" St.date Observation start date in ISO 8601
format; UTC
221 A1 --- --- [T]
222- 229 A8 "h:m:s" St.time Observation start time in ISO 8601
format; UTC
231- 241 F11.6 yr Start [2003.58/2012.11] Observation start
time in decimal year
243- 251 F9.6 arcsec SepG [0.16/61]? Angular offset between
target and closest Gaia source
253- 254 I2 --- Ngaia [0/12] Number of Gaia sources with
17.5"
256- 277 E22.16 --- GaiaDR3 ? Gaia DR3 source identifier (2)
279- 291 F13.6 pc DistG [-15480/27514]? Gaia DR3 distance
(inverted parallax) (2)
293- 305 F13.6 pc e_DistG [-23750/20690]? Lower uncertainty
in DistG
307- 319 F13.6 pc E_DistG [-32249/472664]? Upper uncertainty
in DistG
321- 330 F10.6 mas plxG [-3.1/416]? Gaia DR3 parallax (2)
332- 339 F8.6 mas e_plxG [0.009/2.3]? Uncertainty in Gplx
341- 351 F11.6 --- Ratio [-2.9/6073]? Ratio of Gaia error to
target parallax
353- 364 F12.6 mas/yr pmRA [-3867/3386]? Gaia DR3 proper
motion along RA
366- 377 F12.6 mas/yr pmDE [-2700/585]? Gaia DR3 proper motion
along DE
379- 388 F10.6 deg RAGdeg ? Gaia DR3 Right Ascension (J2000)
390- 399 F10.6 deg DEGdeg ? Gaia DR3 Declination (J2000)
401- 413 F13.6 pc Dist [-15480/27514]? Best available
source distance (3)
415- 427 F13.6 pc e_Dist [-32249/472664]? Lower uncertainty
in Dist
429- 441 F13.6 pc E_Dist [-23750/20690]? Upper uncertainty
in Dist
443- 452 F10.6 ct/s CRNUVmin [0.005/675] Minimum NUV lightcurve
count rate
454- 461 F8.6 ct/s e_CRNUVmin [0.07/5] Uncertainty in CRNUVmin
463- 471 F9.6 mag NUVmagmin [13/26] Minimum NUV AB magnitude
473- 480 F8.6 mag e_NUVmagmin [0.008/3] Uncertainty in NUVmagmin
482- 492 F11.6 ct/s CRNUVmax [1.7/1612] Maximum NUV lightcurve
count rate
494- 501 F8.6 ct/s e_CRNUVmax [0.2/8] Uncertainty in CRNUVmax
503- 511 F9.6 mag NUVmagmax [12/19.5] Maximum NUV AB magnitude
513- 520 F8.6 mag e_NUVmagmax [0.005/0.4] Uncertainty in
NUVmagmax
522- 531 F10.6 ct/s CRNUV [0.9/701] Mean NUV lightcurve count
rate
533- 540 F8.6 ct/s e_CRNUV [0.02/0.8] Uncertainty in CRNUV
542- 550 F9.6 mag NUVmag [12.9/20.2] Mean NUV lightcurve AB
magnitude
552- 559 F8.6 mag e_NUVmag [0.001/0.04] Uncertainty in NUVmag
561- 572 F12.1 s startNUV [743928002/1012618567] NUV start
time; GALEX time scale (G1)
574- 585 F12.1 s stopNUV [743929712/1012619167] NUV stop
time; GALEX time scale (G1)
587- 592 F6.1 s expNUV [480/1710] Raw NUV exposure time (4)
594- 603 F10.7 ct/s CRFUVmin [0/47]? Minimum FUV lightcurve
count rate
605- 612 F8.6 ct/s e_CRFUVmin [0/1.3]? Uncertainty in CRFUVmin
614- 622 F9.6 mag FUVmagmin [14.6/33.3]? Minimum FUV AB
magnitude
624- 631 F8.6 mag e_FUVmagmin [0.028/5.5]? Uncertainty in
FUVmagmin
633- 642 F10.6 ct/s CRFUVmax [0.19/501]? Maximum FUV lightcurve
count rate
644- 651 F8.6 ct/s e_CRFUVmax [0.08/4.2]? Uncertainty in CRFUVmax
653- 661 F9.6 mag FUVmagmax [12/20.6]? Maximum FUV AB magnitude
663- 670 F8.6 mag e_FUVmagmax [0.008/0.8]? Uncertainty in
FUVmagmax
672- 681 F10.6 ct/s CRFUV [0.09/122]? Mean FUV lightcurve
count rate
683- 690 F8.6 ct/s e_CRFUV [0.008/0.4]? Uncertainty in CRFUV
692- 700 F9.6 mag FUVmag [13.6/21.5]? Mean FUV
lightcurve AB magnitude
702- 709 F8.6 mag e_FUVmag [0.002/0.2]? Uncertainty in
FUVmag
711- 721 F11.1 s startFUV ? FUV start time; GALEX time scale
(G1)
723- 733 F11.1 s stopFUV ? FUV stop time; GALEX time scale
(G1)
735- 740 F6.1 s exptFUV [150/1710]? Raw FUV exposure time
(4)
742- 749 F8.6 --- ratiomin [2e-06/2.1]? Minimum FUV/NUV
lightcurve flux ratio
751- 758 F8.6 --- e_ratiomin [0.0002/0.4]? Uncertainty in
ratiomin
760- 768 F9.6 --- ratiomax [0.03/49]? Maximum FUV/NUV
lightcurve flux ratio
770- 778 F9.6 --- e_ratiomax [0.007/11]? Uncertainty in ratiomax
780- 788 F9.6 --- rationuvmax [0/42]? FUV/NUV flux ratio at
maximum NUV flux
790- 797 F8.6 --- e_rationuvmax [0.007/7.7]? Uncertainty in
rationuvmax
799- 809 F11.6 s effexpNUV [436/1570] Integrated effective NUV
exposure time (5)
811- 823 F13.6 ct cts9 [11/155228] Total NUV counts in the
9" aperture (6)
825- 837 F13.6 ct cts12.5 [15/164165] Total NUV counts in the
12.5" aperture (6)
839- 851 F13.6 ct cts17.5 [26/170683] Total NUV counts in the
17.5" aperture (6)
853- 865 F13.6 ct cts25 [42/177250] Total NUV counts in the
25" aperture (6)
867- 879 F13.6 ct cts35 [82/221332]? Total NUV counts in
the 35" aperture (6)
881- 892 F12.6 ct/s CRskyNUV [477/60361]? Estimated sky
background count rate in NUV
aperture (7)
894- 903 F10.6 ct/s e_CRskyNUV [15/176]? Uncertainty in CRskyNUV
905- 907 F3.1 cW/m2/nm FskyNUV [0]? Estimated sky background
flux in NUV aperture;
erg/s/cm2/Å
(always "0.0") (7)
909- 911 F3.1 cW/m2/nm e_FskyNUV [0]? Uncertainty in FskyNUV
(always "0.0")
913- 923 F11.6 s effexpFUV [153.9/1696]? Integrated effective
FUV exposure time (5)
925- 935 F11.6 ct/s CRskyFUV [20/2050]? Estimated sky background
count rate in FUV aperture (7)
937- 945 F9.6 ct/s e_CRskyFUV [3/32.4]? Uncertainty in CRskyFUV
947- 949 F3.1 cW/m2/nm FskyFUV [0]? Estimated sky background
flux in FUV aperture;
erg/s/cm2/Å
(always "0.0") (7)
951- 953 F3.1 cW/m2/nm e_FskyFUV [0]? Uncertainty in FskyFUV
(always "0.0")
955 A1 --- Morph Manually-determined light curve
morphology flag (always "F"=Flare)
(8)
957 I1 --- QANUV [0/1] Manually-determined data QA
flag for NUV (0=nominal;
1=off-nominal)
959 I1 --- QAFUV [0/1] Manually-determined data QA
flag for FUV (0=nominal;
1=off-nominal)
961- 970 F10.6 [mJ/m2] logFluNUV [-11.4/-6.9]? Log10 integrated
flare NUV fluence; erg/cm2
972- 981 F10.6 [mJ/m2] e_logFluNUV [-11.7/-9.8]? Uncertainty in
logFluNUV
983- 992 F10.6 [mJ/m2] logFluFUV [-12.3/-7.2]? Log10 integrated
flare FUV fluence; erg/cm2
994-1003 F10.6 [mJ/m2] e_logFluFUV [-12/-9.8]? Uncertainty in
logFluFUV
1005-1013 F9.6 [10-7J] logEngNUV [28.2/36.2]? Log10 integrated flare
NUV energy; erg
1015-1023 F9.6 [10-7J] e_logEngNUV [27.5/35.4]? Lower uncertainty in
lologEngNUV
1025-1033 F9.6 [10-7J] E_logEngNUV [27.5/35.4]? Upper uncertainty in
lologEngNUV
1035-1043 F9.6 [10-7J] logEngFUV [28/35.6]? Log10 integrated flare
FUV energy; erg
1045-1053 F9.6 [10-7J] e_logEngFUV [27.8/34.8]? Lower uncertainty in
lologEngFUV
1055-1063 F9.6 [10-7J] E_logEngFUV [27.8/34.8]? Upper uncertainty in
lologEngFUV
1065-1070 F6.1 s Dur [60/1410] Flare duration
1072 I1 --- LeftCen [0/1] Flare extent includes first
observation time bin flag
1074 I1 --- RightCen [0/1] Flare extent includes last
observation time bin flag
1076-1085 F10.6 ct/s CRNUVpk [0.59/788]? Maximum flare NUV
lightcurve count rate
1087-1094 F8.6 ct/s e_CRNUVpk [0.14/5.5]? Uncertainty in
CRpeakNUV
1096-1098 F3.1 [cW/m2/nm] FNUVpk [0.0]? Maximum flare NUV lightcurve
flux; erg/s/cm2/Å
(always "0.0")
1100-1102 F3.1 [cW/m2/nm] e_FNUVpk [0.0]? Uncertainty in FNUVpk
(always "0.0")
1104-1112 F9.6 mag NUVmagpk [12.8/20.7]? Maximum flare NUV
lightcurve AB magnitude
1114-1121 F8.6 mag e_NUVmagpk [0.007/0.5]? Uncertainty in
NUVmagpk
1123-1134 F12.1 s t0NUVpk [743928466/1012618701] Starting bin
timestamp of flare maximum NUV
1136 I1 --- CenPk [0/1] Flag that maximum was in
first/last time bin (10)
1138-1147 F10.6 ct/s CRNUVqui [0.77/701] Estimated quiescence
count rate of NUV lightcurve (11)
1149-1156 F8.6 ct/s e_CRNUVqui [0.02/0.8] Uncertainty in CRNUVqui
1158-1160 F3.1 [cW/m2/nm] FNUVqui [0.0] Estimated quiescence flux of
NUV lightcurve; erg/cm2/s
(always "0.0") (11)
1162-1164 F3.1 [cW/m2/nm] e_FNUVqui [0.0] Uncertainty in FNUVqui
(always "0.0")
1166-1174 F9.6 mag NUVmagqui [12.9/20.4] Estimated quiescence AB
magnitude of NUV lightcurve (11)
1176-1183 F8.6 mag e_NUVmagqui [0.001/0.1] Uncertainty in
NUVmagqui
1185-1194 F10.6 ct/s CRFUVpk [0/196]? Maximum flare FUV
lightcurve count rate
1196-1203 F8.6 ct/s e_CRFUVpk [0/2.6]? Uncertainty in CRFUVpk
1205-1207 F3.1 [cW/m2/nm] FFUVpk [0.0]? Maximum flare FUV lightcurve
flux; erg/s/cm2/Å
(always "0.0")
1209-1211 F3.1 [cW/m2/nm] e_FFUVpk [0.0]? Uncertainty in FFUVpk
(always "0.0")
1213-1221 F9.6 mag FUVmagpk [13/25.3]? Maximum flare FUV
lightcurve AB magnitude
1223-1233 F11.1 s t0FUVpk ? Starting bin timestamp of flare
maximum FUV
1235-1243 F9.6 ct/s CRFUVqui [0.04/52]? Estimated quiescence
count rate of FUV lightcurve (11)
1245-1252 F8.6 ct/s e_CRFUVqui [0.005/0.3]? Uncertainty in
CRFUVqui
1254-1256 F3.1 [cW/m2/nm] FFUVqui [0.0]? Estimated quiescence flux of
FUV lightcurve; erg/cm2/s
(always "0.0") (11)
1258-1260 F3.1 [cW/m2/nm] e_FFUVqui [0.0]? Uncertainty in FFUVqui
(always "0.0")
1262-1270 F9.6 mag FUVmagqui [11.7/19.1]? Estimated quiescence
AB magnitude of FUV lightcurve (11)
1272-1279 F8.6 mag e_FUVmagqui [0.001/0.08]? Uncertainty in
FUVmagqui
--------------------------------------------------------------------------------
Note (1): Approximately equivalent to a mission orbit counter.
Note (2): Of closest source to target position.
Note (3): This uses the Gaia distance if available, failing back to the
SIMBAD provided distance, or none.
Note (4): The difference between the observation start and end times.
Not adjusted for detector dead time effects or data dropouts.
Note (5): Corrected for dead time effects.
Note (6): Integrated photon events over the whole observation, not corrected
exposure time.
Note (7): Computed by rescaling flux measurement from the annulus.
Note (8): Based only on qualitative assessment of lightcurve morphology.
Note (10): Complete flare observed?
0 = No;
1 = Yes.
Note (11): instantaneous non-flare.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 --- ObsID [1929/46117] GALEX observation eclipse
number
7- 17 I11 --- Index [107225304/99999930574]? GFCAT
photometric object index (1)
19- 28 F10.6 deg RAdeg Right Ascension (J2000)
30- 39 F10.6 deg DEdeg [-68.6/67] Declination (J2000)
41 I1 --- Nsim [0/5] Number of Simbad sources within
17.5"
43- 94 A52 --- OType Unique Simbad object types of all
sources within 17.5"
96-123 A28 --- SName Simbad identifier (2)
125-136 F12.6 pc DistS [8.7/23042]? Simbad-provided
astrophysical distance (2)
138-149 F12.6 pc e_DistS [0.0019/20826]? Lower uncertainty in
DistS (2)
151-162 F12.6 pc E_DistS [-6347/25785]? Upper uncertainty in
DistS (2)
164-171 F8.4 mas plxS [0.04/115]? Simbad-provided parallax (2)
173-178 F6.4 mas e_plxS [0.01/1.1]? Uncertainty in plxS (2)
180-188 F9.6 arcsec SepS [0.57/27]? Angular offset between
target and closest Simbad source
190-199 I10 s GTime [746982259/1008412923] Observation
start time in GALEX mission time units
201-210 A10 "Y/M/D" St.date Observation start date in ISO 8601
format; UTC
211 A1 --- --- [T]
212-219 A8 "h:m:s" St.time Observation start time in ISO 8601
format; UTC
221-231 F11.6 yr Start [2003.68/2011.97] Observation start
time in decimal year
233-241 F9.6 arcsec SepG [0.5/27.3] Angular offset between
target and closest Gaia source
243 I1 --- Ngaia [0/6] Number of Gaia sources with
17.5"
245-266 E22.17 --- GaiaDR3 ? Gaia DR3 source identifier (2)
268-279 F12.6 pc DistG [-4837/2744]? Gaia DR3 distance
(inverted parallax) (2)
281-293 F13.6 pc e_DistG [-23192/530]? Lower uncertainty in DistG
(2)
295-306 F12.6 pc E_DistG [-6346/-0.0019]? Upper uncertainty in
DistG (2)
308-317 F10.6 mas plxG [-1.7/115]? Gaia DR3 parallax (2)
319-326 F8.6 mas e_plxG [0.014/1.1]? Uncertainty in plxG
328-338 F11.6 --- Ratio [-2.6/4568]? Ratio of Gaia error to
target parallax
340-350 F11.6 mas/yr pmRA [-174/482]? Gaia DR3 proper motion
along RA
352-362 F11.6 mas/yr pmDE [-377/73]? Gaia DR3 proper motion along
DE
364-373 F10.6 deg RAGdeg ? Gaia DR3 Right Ascension (J2000)
375-384 F10.6 deg DEGdeg [-68.6/67]? Gaia DR3 Declination (J2000)
386-397 F12.6 pc Dist [-4837/2744]? Best available source
distance (3)
399-410 F12.6 pc e_Dist [-6346/-0.0019]? Lower uncertainty in
Dist
412-424 F13.6 pc E_Dist [-23192/530]? Upper uncertainty in Dist
426-435 F10.6 ct/s CRNUVmin [0.3/135] Minimum NUV lightcurve count
rate
437-444 F8.6 ct/s e_CRNUVmin [0.1/7] Uncertainty in CRNUVmin
446-454 F9.6 mag NUVmagmin [14.7/21.4] Minimum NUV AB magnitude
456-463 F8.6 mag e_NUVmagmin [0.017/0.6] Uncertainty in NUVmagmin
465-474 F10.6 ct/s CRNUVmax [1.5/473] Maximum NUV lightcurve count
rate
476-483 F8.6 ct/s e_CRNUVmax [0.2/7.2] Uncertainty in CRNUVmax
485-493 F9.6 mag NUVmagmax [13.3/19.7] Maximum NUV AB magnitude
495-502 F8.6 mag e_NUVmagmax [0.01/0.3] Uncertainty in NUVmagmax
504-513 F10.6 ct/s CRNUV [1/270] Mean NUV lightcurve count rate
515-522 F8.6 ct/s e_CRNUV [0.02/0.5] Uncertainty in CRNUV
524-532 F9.6 mag NUVmag [14/20.1] Mean NUV lightcurve AB
magnitude
534-541 F8.6 mag e_NUVmag [0.001/0.03] Uncertainty in NUVmag
543-554 F12.1 s startNUV [746982253/1008412898] NUV start time;
GALEX time scale (G1)
556-567 F12.1 s stopNUV [746983933/1008414398] NUV stop time;
GALEX time scale (G1)
569-574 F6.1 s exptNUV [900/1710] Raw NUV exposure time (4)
576-584 F9.6 ct/s CRFUVmin [0/20]? Minimum FUV lightcurve count rate
586-593 F8.6 ct/s e_CRFUVmin [0/2.4]? Uncertainty in CRminFUV
595-603 F9.6 mag FUVmagmin [15.5/25]? Minimum FUV AB magnitude
605-612 F8.6 mag e_FUVmagmin [0.04/1.6]? Uncertainty in FUVmagmin
614-623 F10.6 ct/s CRFUVmax [0.55/165]? Maximum FUV lightcurve
count rate
625-632 F8.6 ct/s e_CRFUVmax [0.13/2.4]? Uncertainty in CRmaxFUV
634-642 F9.6 mag FUVmagmax [13.2/19.5]? Maximum FUV AB magnitude
644-651 F8.6 mag e_FUVmagmax [0.015/0.6]? Uncertainty in FUVmagmax
653-661 F9.6 ct/s CRFUV [0.1/86.4]? Mean FUV lightcurve count
rate
663-670 F8.6 ct/s e_CRFUV [0.008/0.3]? Uncertainty in CRFUV
672-680 F9.6 mag FUVmag [13.9/21.3]? Mean FUV lightcurve AB
magnitude
682-689 F8.6 mag e_FUVmag [0.002/0.08]? Uncertainty in meanFUVmag
691-701 F11.1 s startFUV ? FUV start time; GALEX mission time
units
703-713 F11.1 s stopFUV ? FUV stop time; GALEX mission time units
715-720 F6.1 s exptFUV [600/1710]? Raw FUV exposure time (4)
722-729 F8.6 --- ratiomin [0.01/1.4]? Minimum FUV/NUV lightcurve
flux ratio
731-738 F8.6 --- e_ratiomin [0.02/0.6]? Uncertainty in ratiomin
740-747 F8.6 --- ratiomax [0.7/4]? Maximum FUV/NUV lightcurve
flux ratio
749-756 F8.6 --- e_ratiomax [0.04/1.5]? Uncertainty in ratiomax
758-765 F8.6 --- rationuvmax [0.7/3.8]? FUV/NUV flux ratio at
maximum NUV flux
767-774 F8.6 --- e_rationuvmax [0.04/1]? Uncertainty in rationuvmax
776-786 F11.6 s effexpNUV [807/1566]? Integrated effective NUV
exposure time (5)
788-800 F13.6 ct cts9 [83/199109] Total NUV counts in the 9"
aperture (6)
802-814 F13.6 ct cts12.5 [115/210540] Total NUV counts in the
12.5" aperture (6)
816-828 F13.6 ct cts17.5 [171/217694] Total NUV counts in the
17.5" aperture (6)
830-842 F13.6 ct cts25 [306/224772] Total NUV counts in the
25" aperture (6)
844-856 F13.6 ct cts35 [553/232890] Total NUV counts in the
35" aperture (6)
858-868 F11.6 ct/s CRskyNUV [810/7987] Estimated sky background
count rate in NUV aperture (7)
870-878 F9.6 ct/s e_CRskyNUV [20/64] Uncertainty in CRskyNUV
880-882 F3.1 cW/m2/nm FskyNUV [0] Estimated sky background flux in
NUV aperture; erg/s/cm2/Å (7)
884-886 F3.1 cW/m2/nm e_FskyNUV [0] Uncertainty in FskyNUV
888-898 F11.6 s effexpFUV [602/1690]? Integrated effective FUV
exposure time (5)
900-910 F11.6 ct/s CRskyFUV [87/1217]? Estimated sky background
count rate in FUV aperture (7)
912-920 F9.6 ct/s e_CRskyFUV [6.6/25]? Uncertainty in CRskyFUV
922-924 F3.1 cW/m2/nm FskyFUV [0]? Estimated sky background flux in
FUV aperture; erg/s/cm2/Å (7)
926-928 F3.1 cW/m2/nm e_FskyFUV [0]? Uncertainty in FskyFUV
930 A1 --- Morph Manually-determined light curve
morphology flag (always "E"=Eclipse)
932 I1 --- QANUV [0] Manually-determined data QA flag
for NUV (always "0"=nominal)
934 I1 --- QAFUV [0] Manually-determined data QA flag
for FUV (always "0"=nominal)
--------------------------------------------------------------------------------
Note (1): Approximately equivalent to a mission orbit counter.
Note (2): Of closest source to target position.
Note (3): This uses the Gaia distance if available, failing back to the
SIMBAD provided distance, or none.
Note (4): The difference between the observation start and end times.
Not adjusted for detector dead time effects or data dropouts.
Note (5): Corrected for dead time effects or data dropouts.
Note (6): Integrated photon events over the whole observation, not corrected
exposure time.
Note (7): Computed by renormalizing flux measurement from the background annulus
to the area of the photometric aperture.
--------------------------------------------------------------------------------
Global notes:
Note (G1): Some time values are in "GALEX Time" scale. This is equivalent to
UNIX Time minus 315964800, in seconds
(i.e. GALEX TIME = UNIX TIME - 315964800).
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 29-Dec-2023