SIMPLE = T / file does conform to FITS standard BITPIX = 8 / number of bits per data pixel NAXIS = 0 / number of data axes EXTEND = T / FITS dataset may contain extensions COMMENT FITS (Flexible Image Transport System) format is defined in 'AstronomyCOMMENT and Astrophysics', volume 376, page 359; bibcode: 2001A&A...376..359H TELESCOP= 'SWIFT ' / Telescope (mission) name INSTRUME= 'XRT ' / Instrument name OBS_ID = '01044382000' / Observation ID TARG_ID = '1044382 ' / Target ID SEG_NUM = '0 ' / Segment number TIMESYS = 'TT ' / time system MJDREFI = 51910 / MJD reference day 01 Jan 2001 00:00:00 MJDREFF = 0.00074287037 / MJD reference (fraction of day) 01 Jan 2001 00:TIMEUNIT= 's ' / Time unit for timing header keywords TIERRELA= 1.0E-08 / [s/s] Estimated relative clock rate error TIERABSO= 1. / [s] Estimated absolute clock offset error TSTART = 640636644.39412 / Start time DATE-OBS= '2021-04-20T18:34:32' TSTOP = 640636749.93614 / Stop time DATE-END= '2021-04-20T18:39:04' CLOCKAPP= F / If clock correction are applied (F/T) ORIGIN = 'GSFC ' / Source of FITS file CREATOR = 'TDRSS2FITS V3.22' / Program that created this FITS file TLM2FITS= 'V3.22 ' / Telemetry converter version number DATE = '2021-04-30T11:51:20' / file creation date (YYYY-MM-DDThh:mm:ss UT) UTCFINIT= -26.8796200000000 / [s] UTCF at TSTART CHECKSUM= 'nLBTpJ9QnJAQnJ9Q' / HDU checksum updated 2021-04-30T12:40:11 DATASUM = ' 0' / data unit checksum updated 2021-04-30T11:51:20 OBJECT = 'GRB210420b' XOBS_ID = 01044382000 / Generating sequence PROCVER = '3.18.15 ' / Processing script version SOFTVER = 'Hea_27Jul2015_V6.17_Swift_Rel4.5(Bld34)_27Jul2015_SDCpatch_18' CALDBVER= 'b20171016_u20201215_x20200724_m20210113' / CALDB index versions used END XTENSION= 'BINTABLE' / binary table extension BITPIX = 8 / 8-bit bytes NAXIS = 2 / 2-dimensional binary table NAXIS1 = 18 / width of table in bytes NAXIS2 = 100 / number of rows in table PCOUNT = 0 / size of special data area GCOUNT = 1 / one data group (required keyword) TFIELDS = 3 / number of fields in each row TTYPE1 = 'TIME ' / label for field 1 TFORM1 = '1D ' / data format of field: 8-byte DOUBLE TUNIT1 = 's ' / physical unit of field TTYPE2 = 'RATE ' / label for field 2 TFORM2 = '1D ' / data format of field: 8-byte DOUBLE TUNIT2 = 'count/s ' / physical unit of field TTYPE3 = 'XRTMODE ' / label for field 3 TFORM3 = '1I ' / data format of field: 2-byte INTEGER EXTNAME = 'RATE ' / name of this binary table extension MESGNAME= 'XRT_LIGHTCURVE' / Name of the message COMMENT XRTMODE values COMMENT 1=null 2=Short Image 3=Long Image 4=Pile-Up Photodiode COMMENT 5=Low Rate Photodiode 6=Windowed Timing 7= Photon-Counting COMMENT 8=RAW data 9=Bias map 10=Stop TELESCOP= 'SWIFT ' / Telescope (mission) name INSTRUME= 'XRT ' / Instrument name OBS_ID = '01044382000' / Observation ID TARG_ID = '1044382 ' / Target ID SEG_NUM = '0 ' / Segment number CREATOR = 'TDRSS2FITS V3.22' / Program that created this FITS file ORIGIN = 'GSFC ' / Source of FITS file TLM2FITS= 'V3.22 ' / Telemetry converter version number EQUINOX = 2000 / Equinox RADECSYS= 'FK5 ' / Coordinates system TIMESYS = 'TT ' / Time system MJDREFI = 51910. / Reference MJD Integer part MJDREFF = 0.00074287037 / Reference MJD fractional TIMEUNIT= 's ' / Time unit for the time header keywords TIERRELA= 1.0E-8 / [s/s] relative errors expressed as rate TIERABSO= 1.0 / [s] timing precision in seconds CLOCKAPP= F / If clock correction are applied (F/T) TIMEREF = 'LOCAL ' / Time reference (barycenter/local) TASSIGN = 'SATELLITE' / Time assigned by clock DATE = '2021-04-30T11:51:20' / file creation date (YYYY-MM-DDThh:mm:ss UT) TSTART = 640636644.39412 / Start time DATE-OBS= '2021-04-20T18:37:19' TSTOP = 640636749.93614 / Stop time DATE-END= '2021-04-20T18:39:04' UTCFINIT= -26.8796200000000 / [s] UTCF at TSTART TIMEPIXR= 0. / Bin time beginning=0.0 middle=0.5 end=1. HDUCLASS= 'OGIP ' / Format conforms to OGIP standards HDUCLAS1= 'LIGHTCURVE' / Time ordered data HDUCLAS2= 'TOTAL ' / Source + background HDUCLAS3= 'RATE ' / Data provided as rate NUMBINS = 100 / Number of valid bins in the lightcurve TRIGGER = 1044382 / Trigger Number XRA_OBJ = 254.34880065918 / [deg] XRT RA location GRB or Object XDEC_OBJ= 42.5647811889648 / [deg] XRT DEC location GRb or Object TERMMODE= 0 / XRT termination mode TELAPSE = 105.542019963264 / TSTOP - TSTART ONTIME = 107.359703063965 / Time on target LIVETIME= 107.359703063965 / Ontime multiplied by DEADC EXPOSURE= 107.359703063965 / Total exposure, with all known correction DEADC = 1. / dead time correction UTCCTIME= -26.87962 / [s] UTC Correction TIME UTCCSEC = -27 / UTC Correction Seconds UTCCSUBS= 6019 / [2*10**(-5) s] UTC Correction SUBSeconds PKTTIME = 640636750.14168 / [s] ccsds PacKeT TIME=PKTSEC+PKTSUBS*2e-5 PKTSEC = 640636750 / ccsds PacKeT SEConds PKTSUBS = 7084 / [2*10**(-5) s] ccsds PacKeT SUBSeconds APID = 1253 / Application Process Identifier CHECKSUM= 'miccpiZZmiaamiYY' / HDU checksum updated 2021-04-30T12:40:11 DATASUM = '1651539475' / data unit checksum updated 2021-04-30T11:51:20 PROCVER = '3.18.15 ' / Processing script version SOFTVER = 'Hea_27Jul2015_V6.17_Swift_Rel4.5(Bld34)_27Jul2015_SDCpatch_18' CALDBVER= 'b20171016_u20201215_x20200724_m20210113' / CALDB index versions used END Ar2rAriIAr@ajAs2>@LI AsH@FAtCw@ATAt(N@PܠAuT}@TAun@;*Avf4@KyAvc@8[ AwwW@Q|Aw@S4(Ax@B@AyA @B@Ay@F{Az"@0ܠAz*@M A{3@DA{q @IA|E@FA|Ͷ@@dA}VY@BDXA}"@@ܠA~gQ@?١@A~C@FAx@VA@> A-@IJA>@EAsm@CA$@M 1 A$@ATA5\S@FA@ApAF@X,AE@8[ AW@EA?@C4(Ai/o@@ܠAҞ@DAzu@IJA@::A@@dA^@S4(A@ApA%@= AHA@8[ A6@5A@PAH1@1pA@,aAYx-@- A\@@dAj@1pAa@7kPA|C@2@Ar@= AKI@7kPAx@/١@A@DA'4/@/١@A^@= 1 A8z@1pA@YAI@7kPAcs@IJA[@6{A@W/\AlM@4A@FhA}@6{A6@9JAپ@*:A|@,aA @([ A(L@S4(Ae@0ܠA: @9JA¬2@CAKOa@;*A8@9JA\h@= 1 A8@3Am@*:AN@([ A"}@*:AŬ@= Ah@= 1 A c@G8A@3A*Q@5A@2@A;@1pA;O@::AL@- AՁ@4A^$@0ܠA @:Aok<@3