--- header unit 0: primary ---
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 'Astronomy
COMMENT 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 = '00535764000' / Observation ID
TARG_ID = '535764' / 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 = '2012-10-11T11:17:23' / file creation date (YYYY-MM-DDThh:mm:ss UT)
TSTART = 371647037.700652 / Start time
DATE-OBS = '2012-10-11T11:17:17.7' / Start Date
TSTOP = 371647040.207952 / Stop time
DATE-END = '2012-10-11T11:17:20.2' / Stop Date
UTCFINIT = -9.74724 / UTCF at TSTART
TRIGGER = 535764 / Trigger Number
FRAMENUM = 1316691 / CCD Frame Number
HDUCLASS = 'OGIP' / Format conforms to OGIP standards
HDUCLAS1 = 'IMAGE' / Image data
HDUCLAS2 = 'TOTAL' / Total data values
DATAMODE = 'LONGIMA' / 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 = 2.50730001926422 / TSTOP - TSTART
ONTIME = 2.50730001926422 / Time on target
LIVETIME = 2.50730001926422 / ONTIME multipled by DEADC
EXPOSURE = 2.50730001926422 / Total exposure, with all known corrections
DEADC = 1. / Dead time correction
INVGAIN = 1 / Inverse gain (data were divided by this value)
RAWXCTRD = 316.121002197266 / [pixel] GRB RAWX coordinates CenTRoiD
RAWYCTRD = 337.084716796875 / [pixel] GRB RAWY coordinates CenTRoiD
XRA_OBJ = 260.216430664062 / [deg] XRT RA location of GRB or Object
XDEC_OBJ = 41.1114387512207 / [deg] XRT DEC location of GRB or Object
PA_PNT = 246.189270019531 / [deg] Roll angle from North towards East
RAWXCEN = 316 / RAWX CENter image
CRVAL1 = 316 / WCS reference value
RAWYCEN = 337 / RAWY CENter image
CRVAL2 = 337 / WCS reference value
STDVCTRD = 7.077880859375 / STandard DeViation of CenTRoiD
MAXSTDV = 12. / MAX STandard DeViation of centroid
EVTCTRD = 21 / no. of EVenTs in the CenTRoiD window
MINEVENT = 20 / MInimum No. of EVenTs required for centroid
P2ITER = 1 / 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 = 3 / XRT MODE for image
WAVEFORM = 134 / XRT waveform
P1UTCC = -9.74724 / [s] Packet #1 UTC Correction time
P1UTCCS = -10 / Packet #1 UTC Correction Seconds
P1UTCCSS = 12638 / [2*10**(-5) s] Packet #1 UTC Correction SubSeco
PKT1TIME = 371647043.06146 / [s] ccsds PacKeT #1 TIME=PKT1SEC+PKT1SUBS*2e-5
PKT1SEC = 371647043 / ccsds PacKeT #1 SEConds
PKT1SUBS = 3073 / [2*10**(-5) s] ccsds PacKeT #1 SUBSeconds
CHECKSUM = '4Don5Bon4Bon4Bon' / HDU checksum updated 2012-10-11T11:17:34
DATASUM = '472718097' / data unit checksum updated 2012-10-11T11:17:34
FLUXFACT = 570000015360. / Flux conversion factor
P2UTCC = -9.74724 / [s] Packet #2 UTC Correction time
P2UTCCS = -10 / Packet #2 UTC Correction Seconds
P2UTCCSS = 12638 / [2*10**(-5) s] Packet #2 UTC Correction SubSeco
PKT2TIME = 371647043.14234 / [s] ccsds PacKeT #2 TIME=PKT2SEC+PKT2SUBS*2e-5
PKT2SEC = 371647043 / ccsds PacKeT #2 SEConds
PKT2SUBS = 7117 / [2*10**(-5) s] ccsds PacKeT #2 SUBSeconds
BOREROW = 298. / BOREsight ROW in RAWY
BORECOL = 295.299987792969 / 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 = 10743 / TAM image SEQuence CouNt
TAMCTRDC = T / TAM CenTRoiD Calculated?
TAMCORR = F / TAM CORRection enabled?
NOMEXPO = 2.50729990005493 / [s] NOMinal EXPOsure for flux calculation
RA_PNT = 260.192840576172 / [deg] Spacecraft RA
DEC_PNT = 41.1315727233887 / [deg] Spacecraft Dec
GRBYXRT = 92.1347732543945 / GRB Y in XRT Coords
GRBZXRT = 29.2801475524902 / GRB Z in XRT Coords
XHIGHRA = 260.216437349747 / [deg] XRT HIGH precision GRB RA (double)
XHIGHDEC = 41.1114395614204 / [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 = -9.74724 / [s] Packet #3 UTC Correction time
P3UTCCS = -10 / Packet #3 UTC Correction Seconds
P3UTCCSS = 12638 / [2*10**(-5) s] Packet #3 UTC Correction SubSeco
PKT3TIME = 371647043.26178 / [s] ccsds PacKeT #3 TIME=PKT3SEC+PKT3SUBS*2e-5
PKT3SEC = 371647043 / ccsds PacKeT #3 SEConds
PKT3SUBS = 13089 / [2*10**(-5) s] ccsds PacKeT #3 SUBSeconds