SIGMA is the coded-mask telescope capable to get images and spectra in the 30-1000 keV energy range with ~10' angluar resolutiuon and the field of view (fully coded) of 4.3X4.7 degrees. SIGMA assembly to GRANAT satellite is shown here
The main results from SIGMA include the VERY deep (more than 5 million seconds) imaging of the galactic center region, discovery of the electron-positron annihilation lines from the Galactic "micro-quasar" 1E1740-294, and X-ray Nova Muscae, study of spectra and time variability of the balck-hole candidates.
- SIGMA view of the galactic plane (220K)
- 511 keV line from the X-ray Nova Muscae:
- SIGMA spectrum of the "Great Annihilator" 1E1740-294
- List of publications (69) can be found here
- The Sigma telescope - A decisive step in high energy astronomy // L'Aeronautique et l'Astronautique (1990) NASA ADS
- The SIGMA telescope on the CESR.
- Section on Wikipedia dedicated to GRANATwiki mission