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 = '01090472000' / Observation ID TARG_ID = '1090472 ' / 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 = 661812608.39364 / Start time DATE-OBS= '2021-12-21T20:48:32' TSTOP = 661812788.57444 / Stop time DATE-END= '2021-12-21T20:53:03' 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 = '2021-12-31T08:22:31' / file creation date (YYYY-MM-DDThh:mm:ss UT) UTCFINIT= -28.2977600000000 / [s] UTCF at TSTART CHECKSUM= '2PAO3N6M2NAM2N3M' / HDU checksum updated 2021-12-31T08:48:10 DATASUM = ' 0' / data unit checksum updated 2021-12-31T08:22:31 OBJECT = 'GRB211221A' XOBS_ID = 01090472000 / Generating sequence PROCVER = '3.18.18 ' / Processing script version SOFTVER = 'Hea_27Jul2015_V6.17_Swift_Rel4.5(Bld34)_27Jul2015_SDCpatch_18' CALDBVER= 'b20171016_u20201215_x20210915_m20211105' / 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 = '01090472000' / Observation ID TARG_ID = '1090472 ' / 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 = '2021-12-31T08:22:31' / file creation date (YYYY-MM-DDThh:mm:ss UT) TSTART = 661812608.39364 / Start time DATE-OBS= '2021-12-21T20:50:03' TSTOP = 661812788.57444 / Stop time DATE-END= '2021-12-21T20:53:03' UTCFINIT= -28.2977600000000 / [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 = 1090472 / Trigger Number XRA_OBJ = 78.9325408935547 / [deg] XRT RA location GRB or Object XDEC_OBJ= 0.922417104244232 / [deg] XRT DEC location GRb or Object TERMMODE= 0 / XRT termination mode TELAPSE = 180.18079996109 / TSTOP - TSTART ONTIME = 177.909744262695 / Time on target LIVETIME= 177.909744262695 / Ontime multiplied by DEADC EXPOSURE= 177.909744262695 / Total exposure, with all known correction DEADC = 1. / dead time correction UTCCTIME= -28.29776 / [s] UTC Correction TIME UTCCSEC = -29 / UTC Correction Seconds UTCCSUBS= 35112 / [2*10**(-5) s] UTC Correction SUBSeconds PKTTIME = 661812788.64488 / [s] ccsds PacKeT TIME=PKTSEC+PKTSUBS*2e-5 PKTSEC = 661812788 / ccsds PacKeT SEConds PKTSUBS = 32244 / [2*10**(-5) s] ccsds PacKeT SUBSeconds APID = 1253 / Application Process Identifier CHECKSUM= 'B4CKE1CHB1CHB1CH' / HDU checksum updated 2021-12-31T08:48:10 DATASUM = '800243381' / data unit checksum updated 2021-12-31T08:22:31 PROCVER = '3.18.18 ' / Processing script version SOFTVER = 'Hea_27Jul2015_V6.17_Swift_Rel4.5(Bld34)_27Jul2015_SDCpatch_18' CALDBVER= 'b20171016_u20201215_x20210915_m20211105' / CALDB index versions used END Aù:2bAù:i9Aù:#@ZvAù:7S@ Aù:V@3Aù:HY@7kPAù:ќ@"@Aù:Z@@C4(Aù:?@@dAù:kn@M 1 Aù:(@::Aù:|%@  Aù:o@$Aù:Ǝ+@;*Aù:[@::Aù:ǟX@{Aù:'@([ Aù:ȰA@{Aù:9C@0ܠAù:@,aAù:J@{Aù:+@"@Aù:[-@1pAù:q@7kPAù:m@*:Aù:@@dAù:~[@- Aù:r@- Aù:Ώ@F{Aù:D@0ܠAù:Ϡ@D#Aù:)@8[ Aù:в.^@&{Aù::э@= Aù:t@= 1 Aù:L@@Aù:Ժs@R4Aù:]]@&{Aù:@:Aù:n@  Aù:G0@HAù:`@  Aù:@@Aù:֑0@F{Aù:F@3Aù:עw@([ Aù:+L@@Aù:س{@"@Aù:<`@"@Aù:2@{Aù:Ma? 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