Hard X-ray sky survey with the SIGMA telescope aboard GRANAT observatory

Abstract

During the lifetime of GRANAT orbital observatory the SIGMA telescope collected X-ray images of more than 1/4 of the whole sky. Among these regions the Galactic Center had largest exposure time (~9 million sec). In the present work we review all observations of the SIGMA telescope and present sensitivities achieved with it at different sky regions

6 pages, 5 figures. Accepted for publication in Astronomy Letters