MAXI/GSC FITS Headers (gdt.missions.maxi.gsc.headers)

This module defines all of the FITS headers for the public data files. While these classes are not usually directly called by the user, we may load one up and see the contents and default values. For example, here is the set of header definitions for the event files:

>>> from gdt.missions.maxi.gsc.headers import EventsHeaders
>>> hdrs = EventsHeaders()
>>> hdrs
<EventsHeaders: 3 headers>

Here is the PRIMARY header and default values (retrieved by index):

>>> hdrs[0]
TELESCOP= 'MAXI    '           / Mission name
INSTRUME= 'GSC     '           / Instrument name (GSC, SSC_H or SSC_Z)
GPCMOID = 'NA      '           / Gas Proportional Counter ID
DATAMODE= '' / Data mode (32 or 64 BIT for GSC, STANDARD for S
OBSERVER= 'MAXI Team'          / Principal Investigator
NETWORKI= '' / Network interface (1553B/Ether)
FORMVER = '' / Event file format version
DATATYPE=                    0 / Data Type ID: Obs./Sim./Ground Cal.
DATAFORM=                    0 / Event Data Format ID
DATE-OBS= '' / observation start date and time
TIME-OBS= '' / Start time
DATE-END= '' / observation end date and time
TIME-END= '' / Stop time
TSTART  =                  0.0 / time of first data
TSTOP   =                  0.0 / time of last data
TELAPSE =                  0.0 / TSTOP-TSTART
ONTIME  =                  0.0 / Actual time
RADECSYS= 'FK5     '           / World Coordinate System
EQUINOX =               2000.0 / Equinox for coordinate system
MJDREFI =                51544 / MJD reference day
MJDREFF =  0.00074287037037037 / MJD reference (fraction of day)
TIMEREF = 'LOCAL   '           / reference time
TIMESYS = 'TT      '           / time measured from
TIMEUNIT= 's       '           / unit for time keyword
TIMEDEL =                  0.0 / Smallest time increment
OBJECT  = '' / HEALPix tile number
RA_NOM  =                  0.0 / RA of the tile center [deg]
DEC_NOM =                  0.0 / DEc of the tile center [deg]
RADIUS_I=                  0.0 / inner radius for event extraction [degree]
RADIUS_O=                  0.0 / outer radius for event extraction [degree]
CREATOR = '' / Software
USER    = '' / user name of the creator
ORIGIN  = 'ISAS/JAXA'          / Tape writing institution
HPX_ORDR= 'RING    '           / HEALPIX order scheme (RING or NEST)
HPX_NSID=                    8 / HEALPIX nside
PROCVER = '' / Major.Minor.Tool.CALDB
SEQPNUM =                    1 / Number of the processing with this PROCVER
SOFTVER = '' / HEASOFT version
CALDBVER= '' / CALDB version
NEVENTS =                    0 / Number of events
DETNAM  = '' / Detector
EXPOSURE=                  0.0 / Exposure time
LIVETIME=                  0.0 / On-source time
MJD-OBS =                  0.0 / MJD of data start time
TIMEZERO=                  0.0 / Time Zero
DATE    = '2024-02-22T21:55:28.225' / date of file creation (GMT)

And here is the STDGTI header and default values:

>>> hdrs['STDGTI']
EXTNAME = 'STDGTI  '           / name of this binary table extension
HDUCLASS= 'OGIP    '           / Format conform to OGIP standard
HDUCLAS1= 'GTI     '           / File contains Good Time Intervals
HDUCLAS2= 'STANDARD'           / File contains Good Time Intervals
TELESCOP= 'MAXI    '           / Mission name
DATAMODE= '' / Data mode (32 or 64 BIT for GSC, STANDARD for S
DETNAM  = '' / Detector
INSTRUME= 'GSC     '           / Instrument name (GSC, SSC_H or SSC_Z)
OBJECT  = '' / HEALPix tile number
ONTIME  =                  0.0 / Actual time
EXPOSURE=                  0.0 / Exposure time
LIVETIME=                  0.0 / On-source time
DATE-OBS= '' / observation start date and time
TIME-OBS= '' / Start time
DATE-END= '' / observation end date and time
TIME-END= '' / Stop time
TSTART  =                  0.0 / time of first data
TSTOP   =                  0.0 / time of last data
TELAPSE =                  0.0 / TSTOP-TSTART
MJD-OBS =                  0.0 / MJD of data start time
MJDREFI =                51544 / MJD reference day
MJDREFF =  0.00074287037037037 / MJD reference (fraction of day)
TIMEREF = 'LOCAL   '           / reference time
TIMESYS = 'TT      '           / time measured from
TIMEUNIT= 's       '           / unit for time keyword
EQUINOX =               2000.0 / Equinox for coordinate system
RADECSYS= 'FK5     '           / World Coordinate System
USER    = '' / user name of the creator
FILIN001= '' / Input file name
CREATOR = '' / Software
ORIGIN  = 'ISAS/JAXA'          / Tape writing institution
HDUNAME = 'STDGTI  '           / ASCDM block name
MTYPE1  = 'TIME    '           / Data type
MFORM1  = 'START,STOP'         / names of the start and stop columns
METYP1  = 'R       '           / data descriptor type: Range, binned data
PROCVER = '' / Major.Minor.Tool.CALDB
CALDBVER= '' / CALDB version
SOFTVER = '' / HEASOFT version
SEQPNUM =                    1 / Number of the processing with this PROCVER
OBS_ID  = '' / Observation ID
CLOCKAPP= 'T       '           / If clock correction are applied (F/T)
GPCMOID = 'NA      '           / Gas Proportional Counter ID
OBSERVER= 'MAXI Team'          / Principal Investigator
NETWORKI= '' / Network interface (1553B/Ether)
FORMVER = '' / Event file format version
DATATYPE=                    0 / Data Type ID: Obs./Sim./Ground Cal.
DATAFORM=                    0 / Event Data Format ID
TIMEDEL =                  0.0 / Smallest time increment
RA_NOM  =                  0.0 / RA of the tile center [deg]
DEC_NOM =                  0.0 / DEc of the tile center [deg]
RADIUS_I=                  0.0 / inner radius for event extraction [degree]
RADIUS_O=                  0.0 / outer radius for event extraction [degree]
HPX_ORDR= 'RING    '           / HEALPIX order scheme (RING or NEST)
HPX_NSID=                    8 / HEALPIX nside
DATE    = '2024-02-22T21:55:28.225' / date of file creation (GMT)

See Data File Headers for more information about creating and using FITS headers.

Reference/API

gdt.missions.maxi.gsc.headers Module

Classes

ArfHeaders()	FITS headers for ARFs
EventsHeaders()	FITS headers for event file
RmfHeaders()	FITS headers for RMFs

Class Inheritance Diagram