Instrument Background

Table 38 lists Data Structures with the instrument background models.

Table 38: Instrument Background Model Data Structures.

Data Structure	Description
ISGR-BACK-BKG	ISGRI instrument background array.
ISGR-UNIF-BKG	ISGRI instrument background uniformity array.
PICS-SBAC-BKG	PICsIT instrument background array for single events.
PICS-SUNI-BKG	PICsIT instrument background uniformity array for single events.
PICS-MBAC-BKG	PICsIT instrument background array for multiple events.
PICS-MUNI-BKG	PICsIT instrument background uniformity array for multiple events.
COMP-SBAC-BKG	COMPTON instrument background array for single events.
COMP-SUNI-BKG	COMPTON instrument background uniformity array for single events.
COMP-MBAC-BKG	COMPTON instrument background array for multiple events.
COMP-MUNI-BKG	COMPTON instrument background uniformity array for multiple events.

For each type of Data Structures in Table 38 there is an Index. Its content is given in Table 39. Two last columns (RISE_MIN and RISE_MAX) are present only in ISGR-BACK-BKG-IDX and ISGR-UNIF-BKG-IDX Indexes.

Table 39: Content of Indexes for Table 38 Data Structures.

Column Name	Description
VERSION	Version of the instrument characteristic file
VSTART	Start of validity time in IJD
VSTOP	End of validity time in IJD
E_MIN	Lower bound of the energy range
E_MAX	Upper bound of the energy range
EXPOSURE	Effective exposure time
VETO_THR	Veto threshold
METH_BKG	Method used to produce this background image
RISE_MIN	Minimum event rise time channel 0-127
RISE_MAX	Maximum event rise time channel 0-127