New insights on cosmic gamma-ray bursts from the APEX experiment

Details New insights on cosmic gamma-ray bursts from the APEX experiment New insights on cosmic gamma-ray bursts from the APEX experiment

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991p%26ss...39...23m&link_type=abstract

(Colloquium on Phobos-Mars Mission, Paris, France, Oct. 23-27, 1989, Proceedings. A91-29558 11-91) Planetary and Space Science (

Astronomy and Astrophysics

Astronomy

10

Astronomical Spectroscopy, Gamma Ray Bursts, Spaceborne Astronomy, Cosmic Rays, Energy Spectra, Microprocessors, Neutron Stars, Phobos, Space Missions

Scientific paper

The first results obtained from the Phobos mission are reviewed, pointing out the interesting features appearing in the APEX data for 13 bursts. The experiment used a CsI(Tl) detector (10 x 10 cm cylinder) operating in the 64 keV-9.2 MeV energy range and microprocessor electronics. Evidence has been obtained for fast spectral evolution with a time resolution of several tens of milliseconds; various spectral components are found to vary on this scale. Observations indicate that the previously known absorption-like features below 100 keV as well as spectral features in the range 200-1200 keV are present. A general conclusion is drawn that both multipulse time histories and multicomponent energy spectra reflect the complex time/energy behavior of cosmic gamma-ray bursts. It is suggested that these observations may be explained by the superposition of variable elementary sources radiating gamma-rays in the vicinity of a neutron star.

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