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IBIS - Imager on-board INTEGRAL Satellite

The IBIS telescope is an high angular resolution gamma-ray imager on-board the INTEGRAL Observatory, successfully launched from Baikonur (Kazakhstan) the 17th of October 2002. This medium size ESA project, planned for a 2 year mission with possible extension to 5, is devoted to the observation of the gamma-ray sky in the energy range from 3 keV to 10 MeV. The ESA observatory INTEGRAL (International Gamma-Ray Astrophysics Laboratory) is dedicated to the fine spectroscopy (2.5 keV FWHM @ 1 MeV) and fine imaging (angular resolution: 12 arcmin FWHM) of celestial gamma-ray sources in the energy range 15 keV to 10 MeV with concurrent source monitoring in the X-ray ( 3-35 keV) and optical ( V-band, 550 nm) energy ranges. INTEGRAL carries two main gamma-ray instruments, the spectrometer SPI - optimized for the high-resolution gamma-ray line spectroscopy (20 keV-8 MeV), and the imager IBIS - optimized for high-angular resolution imaging (15 keV-10 MeV). Two monitors, JEM-X in the ( 3-35) keV X-ray band, and OMC in optical Johnson V-band complement the payload.

Instrument	Topic	Principal investigator institutes
SPI	Spectrometer with cooled Ge detectors, coded mask and active shield	J.-P. Roques, CESR Toulouse, France and V. Schoenfelder, MPE Garching, Germany
IBIS	Imager with two detector layers (CdTe array, 16 000 pixels and Csl array, 4000 pixels) and coded mask	P. Ubertini, IAS Rome Italy; F. Lebrun, CE-Saclay, France; G. DiCocco, ITESRE Bologna, Italy
JEM-X	X-ray monitor with microstrip proportional counter and coded mask	N. Lund, DSRI, Copenhagen, Denmark
OMC	Optical monitor with CCD and lens optics	M. Mas-Hesse, LAEFF-INTA, Madrid, Spain

The ground segment includes the Mission Operations Centre at ESOC, ESA and NASA ground stations, the Science Operations Centre at ESTEC and the Science Data Centre near Geneva.

IASF Rome - Via Fosso del Cavaliere 100 - Rome Italy tel. + 39 06 49934094 fax + 39 06 49934092