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  = '01080859000'        / Observation ID                                 TARG_ID = '1080859 '           / 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  =      656716078.00784 / Start time                                     DATE-OBS= '2021-10-23T21:05:47'                                                 TSTOP   =      656716317.33644 / Stop time                                      DATE-END= '2021-10-23T21:11:52'                                                 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    = '2021-11-02T08:57:52' / file creation date (YYYY-MM-DDThh:mm:ss UT)   UTCFINIT=    -27.9546000000000 / [s] UTCF at TSTART                             CHECKSUM= 'lJAOo99OlGAOl99O'   / HDU checksum updated 2021-11-02T09:43:30       DATASUM = '         0'         / data unit checksum updated 2021-11-02T08:57:52 OBJECT  = 'GRB211023b'                                                          XOBS_ID =          01080859000 / 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_m20210907' / 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  = '01080859000'        / Observation ID                                 TARG_ID = '1080859 '           / 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    = '2021-11-02T08:57:52' / file creation date (YYYY-MM-DDThh:mm:ss UT)   TSTART  =      656716078.00784 / Start time                                     DATE-OBS= '2021-10-23T21:07:53'                                                 TSTOP   =      656716317.33644 / Stop time                                      DATE-END= '2021-10-23T21:11:52'                                                 UTCFINIT=    -27.9546000000000 / [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 =              1080859 / Trigger Number                                 XRA_OBJ =     170.276458740234 / [deg] XRT RA location GRB or Object            XDEC_OBJ=     39.1510696411133 / [deg] XRT DEC location GRb or Object           TERMMODE=                    0 / XRT termination mode                           TELAPSE =      239.32859992981 / TSTOP - TSTART                                 ONTIME  =     236.941436767578 / Time on target                                 LIVETIME=     236.941436767578 / Ontime multiplied by DEADC                     EXPOSURE=     236.941436767578 / Total exposure, with all known correction      DEADC   =                   1. / dead time correction                           UTCCTIME=             -27.9546 / [s] UTC Correction TIME                        UTCCSEC =                  -28 / UTC Correction Seconds                         UTCCSUBS=                 2270 / [2*10**(-5) s] UTC Correction SUBSeconds       PKTTIME =      656716317.44486 / [s] ccsds PacKeT TIME=PKTSEC+PKTSUBS*2e-5      PKTSEC  =            656716317 / ccsds PacKeT SEConds                           PKTSUBS =                22243 / [2*10**(-5) s] ccsds PacKeT SUBSeconds         APID    =                 1253 / Application Process Identifier                 CHECKSUM= 'IQP7INM7INM7INM7'   / HDU checksum updated 2021-11-02T09:43:30       DATASUM = '2847737464'         / data unit checksum updated 2021-11-02T08:57:52 PROCVER = '3.18.18 '           / Processing script version                      SOFTVER = 'Hea_27Jul2015_V6.17_Swift_Rel4.5(Bld34)_27Jul2015_SDCpatch_18'       CALDBVER= 'b20171016_u20201215_x20210915_m20210907' / CALDB index versions used END                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             AÒX�
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