| Issue |
A&A
Volume 411, Number 1, November III 2003
Special letters issue on: first science with integral
|
|
|---|---|---|
| Page(s) | L141 - L148 | |
| Section | Letters | |
| DOI | https://doi.org/10.1051/0004-6361:20031367 | |
| Published online | 17 November 2003 | |
Letter to the Editor
ISGRI: The INTEGRAL Soft Gamma-Ray Imager *
1
CEA-Saclay, DSM/DAPNIA/Service d'Astrophysique, 91191 Gif-sur-Yvette Cedex, France,
2
CEA-Grenoble, LETI, 17 rue des Martyrs, Grenoble Cedex 9, France,
3
CEA-Saclay, DSM/DAPNIA/SIS, 91191 Gif-sur-Yvette Cedex, France,
4
CEA-Saclay, DSM/DAPNIA/SEDI, 91191 Gif-sur-Yvette Cedex, France
Corresponding author: F. Lebrun, flebrun@cea.fr
Received:
17
July
2003
Accepted:
4
September
2003
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 cm2 with a spatial resolution of 4.6 mm, a low threshold around 12 keV and an energy resolution of ~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 106 s observation.
Key words: space telescope / cadmium telluride detectors / gamma-ray astronomy / calibration / INTEGRAL / IBIS.
© ESO, 2003
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