Overview of first observations with the French telescope Sigma on board GRANAT

Details Overview of first observations with the French telescope Sigma on board GRANAT Overview of first observations with the French telescope Sigma on board GRANAT

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992eocm.rept...21m&link_type=abstract

In ESA, Environment Observation and Climate Modelling Through International Space Projects. Space Sciences with Particular Empha

Astronomy and Astrophysics

Astronomy

Extragalactic Radio Sources, Gamma Ray Astronomy, Gamma Ray Telescopes, Spaceborne Astronomy, X Ray Astronomy, X Ray Sources, Astronomical Satellites, Images, Satellite Instruments, Soviet Satellites, Spaceborne Telescopes

Scientific paper

The hard X-rays, low energy gamma ray telescope SIGMA, one of the main instruments on board the Soviet satellite GRANAT, has performed sky observations in the 35 keV to 1.3 MeV range, both in galactic and extragalactic sources with unprecedent angular resolution in such an energy domain. New results were obtained by imaging the Galactic center region with a 1.5 arc minute accuracy during more than 400 hours distributed in five periods which took place in early Spring and Summer from 1990 to 1992. The 6 by 6 deg region centered on the Galactic center contains more than six highly variable sources in the 100 keV domain. Hard X-ray binaries and bright extragalactic objects were also analyzed and monitored during these observations. The main result obtained by SIGMA was to point out the variability of the sky in the hard X-ray domain.

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