FIELDS

The following is a list of fields found in both the GINGALAC and GINGABGD databases.

RA:

Nominal Right Ascension of the Ginga field of view (1950.0 equinox).

DEC:

Nominal Declination of the Ginga field of view (1950.0 equinox).

LII:

Nominal Galactic Longitude of the Ginga field of view (1950.0 equinox).

BII:

Nominal Galactic Latitude of the Ginga field of view (1950.0 equinox).

BETA:

Angle between the satellite pointing direction and the Sun at the of observation (degrees).

NH:

Galactic hydrogen density in the direction of the Ginga field of view. These values were calculated using an interpolation from data taken Marshall & Clark (1984). This covers the entire sky and uses various 21-cm surveys for its source (Stark et al. 1984; Clearly, Heiles & Haslam 1979; Heiles & Clearly 1979).

START_TIME:

Start time of observation. Times are stored in the shf key format, which is seconds since January 1st, 1980 at 00:00 hours UT.

END_TIME:

End time of observation. Times are stored in the shf key format, which is seconds since January 1st, 1980 at 00:00 hours UT.

DURATION:

Duration of observation (i.e. end_time minus start_time; in days).

EXPOSURE:

Total live time on source (in seconds).

COUNT_RATE:

Mean 2-10 keV count rate after background subtraction (counts/second). Counts are taken from the top-layer only.

COUNT_RATE_ERROR:

The uncertainty in 2-10 keV count rate (counts/second).

HR:

Hardness ratio [ , where H and M are the 10-17 keV and 6-10 keV count rates respectively].

HR_ERROR:

The uncertainty in hardness ratio.

SR:

Softness ratio [ , where S and M are the 2-6 keV and 6-10 keV count rates respectively].

SR_ERROR:

The uncertainty in softness ratio.

FILESPEC:

String identifying the set of data products associated with an observation.

RESPFILE:

String identifying the response matrices associated with an observation.

QFLAG:

Quality flag.

MODE:

Mode of observation (i.e. MPC1, MPC2, MPC3 or PC).

TIME_RES:

Increment for temporal data (seconds).

MJDS:

Start time of observation (MJD).

MJDE:

End time of observation (MJD).

SOL_MAX:

Maximum accepted rate of the solid state electron monitor (counts/second).

COR_MIN:

Minimum accepted value for the cut-off rigidity (GeV/c).

COR_MAX:

Maximum accepted value for the cut-off rigidity (GeV/c).

HV_MIN00n:

Minimum accepted high voltage level for detector n.

HV_MAX00n:

Maximum accepted high voltage level for detector n.

YELEV_MIN:

Minimum accepted angle between the satellite pointing direction and the Earth's horizon (degrees).

YELEV_MAX:

Maximum accepted angle between the satellite pointing direction and the Earth's horizon (degrees).

SUD_MIN:

Minimum accepted SUD rate (counts/second).

SUD_MAX:

Maximum accepted SUD rate (counts/second).

HTVOLTS00n:

Observed high voltage level for detector n.

SRCE_MASK:

The detectors in which data has been accumulated (0 = off, 1 = on; i.e. 11110011 indicates that the data has been accumulated from detectors 1-4 and 7-8).

CLN_SIGMA001:

Data lying this number of standard deviations from the observed SUD/PI_MONI correlation were rejected (a value of 0.0 indicates that no attempt was made to exclude data using this correlation).

CLN_SIGMA002:

Data lying this number of standard deviations from the observed SUD/LAC correlation were rejected (a value of 0.0 indicates that no attempt was made to exclude data using this correlation).

CLN_SIGMA003:

Data lying this number of standard deviations from the observed LAC/LAC correlation were rejected (a value of 0.0 indicates that no attempt was made to exclude data using this correlation).

BGD_NDECAY:

Number of decays used in modelling the LAC background.

BGD_DECAY00n:

The e-folding timescale of the nth decay.

BGD_VERSION:

Method of background subtraction used (i.e. local or universal method).

PI_MONI_LO:

Minimum accepted PI_MONI rate (counts/second).

PI_MONI_HI:

Maximum accepted PI_MONI rate (counts/second).

SUNSHINE_MIN:

Minimum accepted value of sunshine flag (0: shadow, 1: sunshine).

SUNSHINE_MAX:

Maximum accepted value of sunshine flag (0: shadow, 1: sunshine).

SUD:

Mean SUD count rate (counts/second).

SUD_ERROR:

The uncertainty in the mean SUD count rate (counts/second).

PI_MONI:

Mean PI_MONI count rate (counts/second).

PI_MONI_ERROR

The uncertainty in the PI_MONI count rate (counts/second).

COR:

Mean cut-off rigidity (GeV/c).

YELEVATION:

Mean angle between the satellite pointing direction and the Earth horizon (degrees).

SOL2:

Mean rate of the solid state electron monitor (counts/second).

SUNSHINE:

Mean value of the sunshine flag.

POINT_RA:

Mean observed Right Ascension (1950.0 equinox).

POINT_DEC:

Mean observed Declination (1950.0 equinox).

ROLL:

Mean roll angle during the observation (degrees).

ANTI:

Mean anti-coincidence rate (counts/second).

YAXIS:

Mean pointing flag (0: Sky, 1: Dark Earth, 2: Bright Earth).

ALT:

Mean satellite altitude (kilometers).

DELTX:

Mean angle between observed pointing direction and the nominal pointing direction (DELTXZ) projected onto the X (short) axis of the collimator (degrees).

DELTZ:

Mean angle between observed pointing direction and the nominal pointing direction (DELTXZ) projected onto the Z (long) axis of the collimator (degrees).

DELTXZ:

Mean angle between observed pointing position and the nominal pointing direction field of view (degrees).

GBD_SC:

Mean Gamma-ray burst detector scintillation counter rate (counts/second).

GBD_PC:

Mean Gamma-ray burst detector proportional counter rate (counts/second).

AG_ENERGY00n:

Best-fit energy of the silver emission line in the nth raw spectrum (n = 1 for the top-layer, n = 2 for the mid-layer).

PL_ALPHA:

Energy index of the best-fit power-law.

PL_ALPHA_LO:

Lower uncertainty on the energy index (all errors are ; 90 percent confidence for one interesting parameter).

PL_ALPHA_HI:

Upper uncertainty on energy index.

PL_NORM:

Power-law normisation (photons/second/cm²/keV at 1 keV).

PL_NORM_LO:

Lower uncertainty on power-law normalisation.

PL_NORM_HI:

Upper uncertainty on power-law normalisation.

PL_NH:

Column density (in units of 10²¹ H atoms cm^-2).

PL_NH_LO:

Lower uncertainty on column density.

PL_NH_HI:

Upper uncertainty on column density.

PL_LINE_PRESENT:

Presence of iron emission line (boolean). True/False if the reduction in chi-square is significant/insignificant at the 95% level (determined by an F-test).

PL_LEN:

Best-fit energy if line present (keV).

PL_LEN_LO:

Lower uncertainty on line energy.

PL_LEN_HI:

Upper uncertainty on line energy.

PL_EW:

Equivalent width of emission line (eV).

PL_EW_LO:

Lower uncertainty on line equivalent width.

PL_EW_HI:

Upper uncertainty on line equivalent width.

PL_REDCHI:

Reduced chi-squared for best-fit (/d.o.f.).

PL_NFREE:

Number of degrees of freedom (d.o.f.).

PL_FLUX:

Absorbed 2-10 keV model flux (10^-12 erg/second/cm²).

BR_KT:

Temperature of best-fit thermal bremsstrahlung model (keV).

BR_KT_LO:

Lower uncertainty on temperature.

BR_KT_HI:

Upper uncertainty on temperature.

BR_NORM:

Bremsstrahlung normalisation (equal to , where is the emission measure in cm^-3 and D is the distance to the source in cm).

BR_NORM_LO:

Lower uncertainty on bremsstrahlung normalisation.

BR_NORM_HI:

Upper uncertainty on bremsstrahlung normalisation.

BR_NH:

Column density (in units of 10²¹ H atoms cm^-2).

BR_NH_LO:

Lower uncertainty on column density.

BR_NH_HI:

Upper uncertainty on column density.

BR_LINE_PRESENT:

Presence of iron emission line (boolean). True/False if the reduction in chi-square is significant/insignificant at the 95% level (determined by an F-test).

BR_LEN:

Best-fit energy if line present (keV).

BR_LEN_LO:

Lower uncertainty on line energy.

BR_LEN_HI:

Upper uncertainty on line energy.

BR_EW:

Equivalent width of emission line (eV).

BR_EW_LO:

Lower uncertainty on line equivalent width.

BR_EW_HI:

Upper uncertainty on line equivalent width.

BR_REDCHI:

Reduced chi-square for best-fit.

BR_NFREE:

Number of degrees of freedom.

BR_FLUX:

Absorbed 2-10 keV model flux (10^-12 erg/second/cm²).

INT_VAR_0206_00n:

Intrinsic 2-6 keV variance for the nth lightcurve (n = 1 for the top-layer, n = 2 for the mid-layer).

INT_VAR_0607_00n:

Intrinsic 6-7 keV variance for the nth lightcurve (n = 1 for the top-layer, n = 2 for the mid-layer).

INT_VAR_0717_00n:

Intrinsic 7-17 keV variance for the nth lightcurve (n = 1 for the top-layer, n = 2 for the mid-layer).

INT_VAR_0217_00n:

Intrinsic 2-17 keV variance for the nth lightcurve (n = 1 for the top-layer, n = 2 for the mid-layer).

The following is a list of additional fields found only in the GINGALAC database.

NAME:

Name of observed object.

TRANSMISSION_MIN:

Minimum accepted transmission (percentage).

TRANSMISSION_MAX:

Maximum accepted transmission (percentage).

TRANSMISSION:

Mean collimator transmission (percentage).

The following is a list of fields found only in the GINGAFRF database.

FRFNAME:

String identifying the name of the FRF.

STATUS:

Observing mode of Ginga (PT: pointing, MN: maneuver).

STARTFLAG:

Flag denoting position of record within each observing slot (1: beginning of slot, 2: end of slot).

SFN:

Superframe number. A FRF consists of varying numbers of major frames which have lengths of 4, 32, or 128 seconds, depending on the bit-rate. The superframe number is the major frame number within the FRF.

TIME:

Time at the beginning or end of a slot. Times are stored in the shf key format, which is seconds since January 1st, 1980.

BIT_RATE:

Bit-rates are 512 bits/second (Low), 2048 bits/second (Medium) and 16384 bits/second (High). The higher the bit-rate the higher the time resolution of the raw data. Bit-rates are stored as H(igh), M(edium) or L(ow).

MODE:

Mode of observation (i.e. MPC1, MPC2, MPC3 or PC).

RA:

Right Ascension at time of record (1950.0 equinox).

DEC:

Declination at time of record (1950.0 equinox).

LII:

Galactic Longitude at time of record (1950.0 equinox).

BII:

Galactic Latitude at time of record (1950.0 equinox).

NAME:

The name of the target based on cross-referencing with the X-ray source catalogue at ISAS. If the name field is empty then there is no catalogued source in the Ginga field of view. This probably indicates that the data is from a background observation.

TRANS:

The collimator transmission at time of record (percentage). A negative values indicates that no transmission information is available or no target in the Ginga field of view.

ATT:

Attitude flag (-1 indicates that attitude information is unreliable).

CAT:

String identifying the tape from which the data originated.

CLASS:

Type of object (not used).