Review of GRANAT Observations of Gamma-Ray Bursts

Details Review of GRANAT Observations of Gamma-Ray Bursts Review of GRANAT Observations of Gamma-Ray Bursts

Sep 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995ap%26ss.231...31t&link_type=abstract

Astrophysics and Space Science, Volume 231, Issue 1-2, pp. 31-34

Astronomy and Astrophysics

Astrophysics

Scientific paper

The GRANAT observatory was launched into a high apogee orbit on 1 December, 1989. Three instruments onboard GRANAT - PHEBUS, WATCH and SIGMA are able to detect gamma-ray bursts in a very broad energy range from 6 keV up to 100 MeV. Over 250 gamma-ray bursts were detected. We discuss the results of the observations of the time histories and spectral evolution of the detected events provided by the different instruments in different energy ranges. Short Gamma-Ray Bursts (< 2 s) have 10 ms structure in their time histories. They have harder energy spectra than the long (> 2 s) events. Evidence of the existence of four differently behaving componenents in gamma-ray burst spectra is discussed. Statistical properties of the gamma-ray burst sources based on the 5 years of observations with (˜ 10-6 erg/cm2) sensitivity as well as the results of high sensitivity (˜ 10-8 erg/cm2) search for Gamma-Ray Bursts within the SIGMA telescope field of view are reviewed.

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