Characteristics of gamma-ray bursts at MeV energies measured by COMPTEL

Details Characteristics of gamma-ray bursts at MeV energies measured by COMPTEL Characteristics of gamma-ray bursts at MeV energies measured by COMPTEL

Oct 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998adspr..22.1097k&link_type=abstract

Advances in Space Research, Volume 22, Issue 7, p. 1097-1100.

Computer Science

7

Scientific paper

We present results from the spectral analysis of 29 gamma-ray bursts measured by the COMPTEL Telescope instrument (0.75-30 MeV) during the period from April 1991 through May 1995. The time-averaged spectra of these events are consistent with a simple power law model with spectral index in the range 1.5-3.5, whereas simple thermal models are statistically inconsistent with the burst sample. We find good agreement between burst spectra measured simultaneously by BATSE, COMPTEL and EGRET, which typically show a spectral transition or ``break'' in the BATSE energy range around a few hundred keV followed by simple power law emission extending to hundreds of MeV. Observations of rapid intensity variations up to a few MeV in the stronger bursts are used to investigate the importance of photon-photon opacity and to place limits on the source distance and bulk Lorentz factor.

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