TTYPE1  = 'TIME    '           / Mission Time in sec since 01 Jan 2021 00:00:00
TFORM1  = '1D      '           / data format of field
TUNIT1  = 's       '           / physical unit of field
TTYPE2  = 'RATE    '           / Background subtracted rate
TFORM2  = '1E      '           / data format of field
TUNIT2  = 'count/s'            / physical unit of field
TTYPE3  = 'ERROR'              / Background subtracted rate error
TFORM3  = '1E      '           / data format of field
TUNIT3  = 'count/s'            / physical unit of field
TTYPE4  = 'TOTRATE'            / Total source rate
TFORM4  = '1E      '           / data format of field
TUNIT4  = 'count/s'            / physical unit of field
TTYPE5  = 'TOTRATE_ERROR'      / Total source rate error
TFORM5  = '1E      '           / data format of field
TUNIT5  = 'count/s'            / physical unit of field
TTYPE6  = 'BKGRATE'            / Background rate
TFORM6  = '1E      '           / data format of field
TUNIT6  = 'count/s'            / physical unit of field
TTYPE7  = 'BKGRATE_ERROR'      / Background rate error
TFORM7  = '1E      '           / data format of field
TUNIT7  = 'count/s'            / physical unit of field
EXTNAME = 'LC      '           / Extension Name
TELESCOP= 'BURSTCUBE'          / Telescope mission name
INSTRUME= 'string'             / Instrument name
DATAMODE= 'CBD     '           / Data mode
OBJECT  = 'string'             / Object name
RA_OBJ  = -99.0                / R.A. Object
DEC_OBJ = -99.0                / Dec Object
POSFLAG = -99                  / Position FLAG 1=good 0=best effort -1=false
EQUINOX = 2000                 / Equinox
RADECSYS= 'FK5'                / Coordinates Systems
OBS_ID  = 'yymmdd'             / Observation ID
MJDREFI =                59215 / MJD reference day 01 Jan 2021 00:00:00
MJDREFF =  0.00080074074074074 / MJD reference (fraction of day)
TIMEREF = 'LOCAL   '           / Reference Frame
TASSIGN = 'SATELLITE'          / Time assigned
TIMESYS = 'TT      '           / Time system
TIMEUNIT= 's       '           / Time unit for timing header keywords
TIMEPIXR=                    1 / Time stamps refer to the end of each bin
TIMEDEL = 0.0                  / Integration time
TRIGGER = 0                    / Trigger number
TRIGTIME= 0.0                  / Trigger Time sec since 01 Jan 2021 00:00:00
TRIGUTC = 'isodate'            / TIME of Trigger time in UTC
CLOCKAPP=                    F / If clock corrections are applied (T/F)
DATE-OBS= 'isodate'            / Start Date
DATE-END= 'isodate'            / Stop Date
TSTART  = 0.0                  / Start Time
TSTOP   = 0.0                  / Stop Time
E_MIN   = 0.0                  / lower energy bound
E_MAX   = 0.0                  / high energy bound
E_UNIT  = 'keV     '           / Unit for the energy
HDUCLASS= 'OGIP    '           / format conforms to the OGIP standard
HDUCLAS1= 'LIGHTCURVE'         / hduclass1
ORIGIN  = 'GSFC    '           / Origin of the fits file
CREATOR = 'string'             / Software that create 1st the file
PROCVER = 'string'             / Processing version
CALDBVER= 'string'             / CALDB version
SEQPNUM = 1                    / Number of times the dataset has been processed
DATE    = 'isodate'            / File creation date
CHECKSUM= 'string'             / data unit checksum updated date
DATASUM = 'string'             / HDU checksum updated date