Volume 411, Number 1, November III 2003
Special letters issue on: first science with integral
|Page(s)||L369 - L372|
|Published online||17 November 2003|
Letter to the Editor
IBIS performances during the Galactic Plane Scan*
I. The Cygnus region
IASF-CNR, via del Fosso del Cavaliere 100, 00133 Roma, Italy
2 CEA Saclay, DSM/DAPNIA/SAp, CNRS FRE 2591, 91191 Gif-sur-Yvette Cedex, France
3 Integral Science Data Center, Chemin d'Écogia 16, 1290 Versoix, Switzerland
4 School of Physics and Astronomy, University of Southampton, Highfield, Southampton, SO17 1BJ, UK
5 IASF/CNR, sezione di Bologna, via P. Gobetti 101, 40129 Bologna, Italy
6 CEA Saclay, DSM/DAPNIA/SAp, 91191 Gif-sur-Yvette Cedex, France
7 IASF/CNR, sezione di Milano, via Bassini 15, 20133 Milano, Italy
8 IASF/CNR, sezione di Palermo, via Ugo La Malfa 153, 90146 Palermo, Italy
Corresponding author: M. Del Santo, firstname.lastname@example.org
Accepted: 8 August 2003
The Plane of our Galaxy is regularly observed by the INTEGRAL satellite by means of scheduled scans. We present here results from the IBIS/ISGRI instrument using data from the first two Galactic Plane Scans performed at the end of the Performance Verification phase, while INTEGRAL was pointed towards the Cygnus region. Considering the predicted IBIS sensitivity, we expected three persistent sources to be detectable: Cyg X-1, Cyg X-3, Cyg X-2, in order of decreasing intensity in the hard-X energy range (>15 keV). In addition to these sources, our analysis revealed two more transient sources, confirming the unprecedented IBIS sensitivity. For each exposure (~2200 s) of the two scans, we report on detected source fluxes, variabilities and localisation accuracies.
Key words: Galactic Plane / X-ray binaries / coded mask telescope / gamma-ray astronomy
© ESO, 2003
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