Letter to the Editor

First results from the IBIS/ISGRI data obtained during the Galactic Plane Scan^*

II. The Vela region

¹ CEA Saclay, DSM/DAPNIA/SAp (CNRS FRE 2591), 91191 Gif-sur-Yvette Cedex, France
² Integral Science Data Center, Chemin d'Écogia, 16, 1290 Versoix, Switzerland
³ IASF/CNR, via del Fosso del Cavaliere 100, 00133 Roma, Italy
⁴ CEA Saclay, DSM/DAPNIA/SAp, 91191 Gif-sur-Yvette Cedex, France
⁵ IASF/CNR, sezione di Bologna, via Gobetti 101, 40129 Bologna, Italy
⁶ IASF/CNR, Sezione di Milano, via Bassini 15, 20133 Milano, Italy
⁷ School of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ UK

Corresponding author: J. Rodriguez, jrodriguez@cea.fr

Received: 2 July 2003
Accepted: 30 July 2003

Abstract

We report on INTEGRAL/IBIS observations of the Vela region during a Galactic Plane Scan (hereafter GPS) presenting the IBIS in-flight performances during these operations. Among all the known sources in the field of view we clearly detect 4U 0836-429, Vela X-1, Cen X-3, GX 301-2, 1E 1145.1-6141, and H0918-549 in the 20-40 keV energy range. Only Vela X-1 and GX 301-2 are detected in the 40-80 keV energy range, and no sources are visible above. We present the results of each individual observation (~2200 s exposure), as well as those from the mosaic of these scans.