SIMPLE  =                    T / file does conform to FITS standard             BITPIX  =                   16 / number of bits per data pixel                  NAXIS   =                    2 / number of data axes                            NAXIS1  =                   51 / length of data axis 1                          NAXIS2  =                   51 / length of data axis 2                          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 MESGNAME= 'XRT_IMAGE'          / Name of the message                            TELESCOP= 'SWIFT   '           / Telescope (mission) name                       INSTRUME= 'XRT     '           / Instrument name                                OBS_ID  = '00779351000'        / Observation ID                                 TARG_ID = '779351  '           / Target ID                                      SEG_NUM = '0       '           / Segment number                                 CREATOR = 'TDRSS2FITS V3.21'   / Program that created this FITS file            ORIGIN  = 'GSFC    '           / Source of FITS file                            TLM2FITS= 'V3.21   '           / 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-08 / [s/s] Estimated relative clock rate error      TIERABSO=                   1. / [s] Estimated absolute clock offset error      CLOCKAPP=                    F / If clock correction are applied (F/T)          TIMEREF = 'LOCAL   '           / Time reference (barycenter/local)              TASSIGN = 'SATELLITE'          / Time assigned by clock                         DATE    = '2017-10-16T07:54:41' / file creation date (YYYY-MM-DDThh:mm:ss UT)   TSTART  =     529833286.996492 / Start time                                     DATE-OBS= '2017-10-16T07:54:47.0' / Start Date                                  TSTOP   =     529833287.096492 / Stop time                                      DATE-END= '2017-10-16T07:54:47.1' / Stop Date                                   UTCFINIT=            -19.84838 / UTCF at TSTART                                 TRIGGER =               779351 / Trigger Number                                 FRAMENUM=             16968492 / CCD Frame Number                               HDUCLASS= 'OGIP    '           / Format conforms to OGIP standards              HDUCLAS1= 'IMAGE   '           / Image data                                     HDUCLAS2= 'TOTAL   '           / Total data values                              DATAMODE= 'SHORTIMA'           / XRT Mode for this data                         CTYPE1  = 'RAWX    '           / WCS  axis type                                 CRPIX1  =                   26 / WCS Reference point                            CDELT1  =                    1 / WCS coordinate increment                       CUNIT1  = 'pixel   '           / WCS axis unit                                  CTYPE2  = 'RAWY    '           / WCS  axis type                                 CRPIX2  =                   26 / WCS Reference point                            CDELT2  =                    1 / WCS coordinate increment                       CUNIT2  = 'pixel   '           / WCS axis unit                                  APID    =                 1250 / Application Process Identifier                 PACKET1 =                    T / Data from packet #1 present                    PACKET2 =                    T / Data from packet #2 present                    PACKET3 =                    T / Data from packet #3 present                    BLANK   =                   -1 / Null data                                      TELAPSE =    0.100000023841858 / TSTOP - TSTART                                 ONTIME  =    0.100000023841858 / Time on target                                 LIVETIME=    0.100000023841858 / ONTIME multipled by DEADC                      EXPOSURE=    0.100000023841858 / Total exposure, with all known corrections     DEADC   =                   1. / Dead time correction                           INVGAIN =                    1 / Inverse gain (data were divided by this value) RAWXCTRD=     302.068176269531 / [pixel] GRB RAWX coordinates CenTRoiD          RAWYCTRD=     297.289764404297 / [pixel] GRB RAWY coordinates CenTRoiD          XRA_OBJ =     40.9175109863281 / [deg] XRT RA location of GRB or Object         XDEC_OBJ=     61.4328117370605 / [deg] XRT DEC location of GRB or Object        PA_PNT  =     23.9109954833984 / [deg] Roll angle from North towards East       RAWXCEN =                  302 / RAWX CENter image                              CRVAL1  =                  302 / WCS reference value                            RAWYCEN =                  297 / RAWY CENter image                              CRVAL2  =                  297 / WCS reference value                            STDVCTRD=     6.77315425872803 / STandard DeViation of CenTRoiD                 MAXSTDV =                  12. / MAX STandard DeViation of centroid             EVTCTRD =                   31 / no. of EVenTs in the CenTRoiD window           MINEVENT=                   20 / MInimum No. of EVenTs required for centroid    P2ITER  =                    2 / Number of iterations for phase2 algorithm      MAXITER =                    4 / MAX ITERation for phase2 algorithm             CONVDIST=                   0. / actual CONVergence DISTance                    MAXCONV =               0.0625 / MAX CONVergence distance                       XRTMODE =                    2 / XRT MODE for image                             WAVEFORM=                  134 / XRT waveform                                   P1UTCC  =            -19.84838 / [s] Packet #1 UTC Correction time              P1UTCCS =                  -20 / Packet #1 UTC Correction Seconds               P1UTCCSS=                 7581 / [2*10**(-5) s] Packet #1 UTC Correction SubSecoPKT1TIME=      529833289.74454 / [s] ccsds PacKeT #1 TIME=PKT1SEC+PKT1SUBS*2e-5 PKT1SEC =            529833289 / ccsds PacKeT #1 SEConds                        PKT1SUBS=                37227 / [2*10**(-5) s] ccsds PacKeT #1 SUBSeconds      CHECKSUM= 'AcAWAc6VAcAVAc5V'   / HDU checksum updated 2017-10-16T07:54:51       DATASUM = '441981497'          / data unit checksum updated 2017-10-16T07:54:51 FLUXFACT=        570000015360. / Flux conversion factor                         P2UTCC  =            -19.84838 / [s] Packet #2 UTC Correction time              P2UTCCS =                  -20 / Packet #2 UTC Correction Seconds               P2UTCCSS=                 7581 / [2*10**(-5) s] Packet #2 UTC Correction SubSecoPKT2TIME=      529833289.86164 / [s] ccsds PacKeT #2 TIME=PKT2SEC+PKT2SUBS*2e-5 PKT2SEC =            529833289 / ccsds PacKeT #2 SEConds                        PKT2SUBS=                43082 / [2*10**(-5) s] ccsds PacKeT #2 SUBSeconds      BOREROW =     298.399993896484 / BOREsight ROW in RAWY                          BORECOL =     292.600006103516 / BOREsight COLumn in RAWX                       BOREPA  =                   0. / [deg] BOREsight roll (Position Angle)          PLATESCA=      2.3573100566864 / [arcsec/pixel] PLATE SCAle                     SCYCORR =                   0. / [arcsec] Spacecraft to XRT Y boresight corr    SCZCORR =                   0. / [arcsec] Spacecraft to XRT Z boresight corr    SCPACORR=                   0. / [deg] Spacecraft to XRT roll boresight corr    TAMREFX1=     327.640014648438 / TAM Ref Window 1 X pos                         TAMREFY1=     237.199996948242 / TAM Ref Window 1 Y pos                         TAMREFX2=     261.324005126953 / TAM Ref Window 2 X pos                         TAMREFY2=                 242. / TAM Ref Window 2 Y pos                         TAMTHETA=                  17. / TAM THETA-t angle XRT-PSU-037                  TAMOPTGN=     1.00999999046326 / TAM OPTical GaiN XRT-LUX-TN-095                TAMPRIPS=     9.49600028991699 / TAM PRImary window Plate Scale                 TAMSECPS=     5.65999984741211 / TAM SECondary window Plate Scale               TAMSEQCN=               134741 / TAM image SEQuence CouNt                       TAMCTRDC=                    T / TAM CenTRoiD Calculated?                       TAMCORR =                    F / TAM CORRection enabled?                        NOMEXPO =    0.100000001490116 / [s] NOMinal EXPOsure for flux calculation      RA_PNT  =     40.9137191772461 / [deg] Spacecraft RA                            DEC_PNT =     61.4305114746094 / [deg] Spacecraft Dec                           GRBYXRT =    -2.61713552474976 / GRB Y in XRT Coords                            GRBZXRT =    -10.2114238739014 / GRB Z in XRT Coords                            XHIGHRA =     40.9175128376908 / [deg] XRT HIGH precision GRB RA (double)       XHIGHDEC=     61.4328108730645 / [deg] XRT HIGH precision GRB DEC (double)      WINHALFW=                   25 / WINdow HALF Width                              MINSTDV =                    5 / MIN STandard DeViation of centroid             TLMVER  =                    3 / Telemetry version from packet #3               P3UTCC  =            -19.84838 / [s] Packet #3 UTC Correction time              P3UTCCS =                  -20 / Packet #3 UTC Correction Seconds               P3UTCCSS=                 7581 / [2*10**(-5) s] Packet #3 UTC Correction SubSecoPKT3TIME=      529833289.94458 / [s] ccsds PacKeT #3 TIME=PKT3SEC+PKT3SUBS*2e-5 PKT3SEC =            529833289 / ccsds PacKeT #3 SEConds                        PKT3SUBS=                47229 / [2*10**(-5) s] ccsds PacKeT #3 SUBSeconds      END                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             4-'
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