Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...255l...9w&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 255, no. 1-2, p. L9-L12.
Astronomy and Astrophysics
Astronomy
30
Gamma Ray Astronomy, Gamma Ray Bursts, Gamma Ray Observatory, Gamma Ray Telescopes, Energy Spectra, Imaging Techniques, Instrument Errors, Spectrum Analysis
Scientific paper
The Compton Gamma-Ray Observatory was launched on April 5, 1991, carrying the imaging Compton telescope COMPTEL. Since its activation on April 25, 1991, COMPTEL has observed several gamma-ray bursts in its 1-sr field of view. The strongest of these bursts was observed on May 3, 1991. Event data over 0.8 MeV to 30 MeV as well as time resolved spectra over 0.1 MeV to 10 MeV have been recorded. For the first time, a direct single-telescope MeV image of a cosmic gamma-ray burst has been produced. The burst is located at (l,b) = (171.8 deg, 6.4 deg) with a statistical uncertainty (99 percent level) of about 2 deg. The systematic error is about 1 deg, due to the location of the burst near the edge of the COMPTEL field-of-view. Spectral analysis indicates that GRB 910503 is a 'classical' hard burst, with power-law emission up to several MeV, showing 'hard-to-soft' spectral evolution in its light curve.
Bennett Kevin
Bloemen Hans
Collmar Werner
Connors Alanna
de Vries Chris
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