Scientific Performances Summary

IBIS is a gamma-ray telescope observing celestial objects of all classes ranging from the most compact galactic systems to extragalactic objects, with powerful diagnostic capabilities of fine imaging, source identification and spectral sensitivity in both continuum and lines. It is able to localize weak sources at low energy to better than a few arcminutes accuracy, covering the entire energy range from a few tens of keV to several MeV. Table 1 gives an overview of the scientific capabilities of IBIS. The effective area curves are given on the Figure 1.

Table 1: Scientific Parameters of IBIS.

Operating energy range	15 keV - 10 MeV
Energy resolution (FWHM)	7% @ 100 keV
	9% @ 1 MeV
Effective Area	ISGRI: 960 cm at 50 keV
	PICsIT: 870 cm at 300 keV (single events)
	PICsIT: 275 cm at 1 MeV (multiple events)
Field of view	8.3 8.0 (fully coded)
	19 19 (partially coded, 50%)
Angular resolution (FWHM)	12
Point source location accuracy	30 @100 keV
(90% error radius)	5 @1 MeV
Continuum sensitivity,	@100 keV
photons cm s keV	1 - 2 @ 1 MeV
(3 detection, , 10 s integration)
Narrow line sensitivity,	@100 keV
photons cm s	@ 1 MeV
(3 , 10 s integration)
Absolute timing accuracy (3 )	ISGRI: 61 s
	PICsIT: 0.976 - 500ms (selected from ground)

Figure 1: IBIS effective area