ISGRI: the INTEGRAL Soft Gamma-Ray Imager

Details ISGRI: the INTEGRAL Soft Gamma-Ray Imager ISGRI: the INTEGRAL Soft Gamma-Ray Imager

2003-10-14

arxiv.org/abs/astro-ph/0310362v1

Astron.Astrophys.411:L141-L148,2003

Astronomy and Astrophysics

Astrophysics

INTEGRAL A&A special issue

Scientific paper

10.1051/0004-6361:20031367

For the first time in the history of high energy astronomy, a large CdTe gamma-ray camera is operating in space. ISGRI is the low-energy camera of the IBIS telescope on board the INTEGRAL satellite. This paper details its design and its in-flight behavior and performances. Having a sensitive area of 2621 cm$^2$ with a spatial resolution of 4.6 mm, a low threshold around 12 keV and an energy resolution of $\sim$ 8% at 60 keV, ISGRI shows absolutely no signs of degradation after 9 months in orbit. All aspects of its in-flight behavior and scientific performance are fully nominal, and in particular the observed background level confirms the expected sensitivity of 1 milliCrab for a 10$^6$s observation.

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