On the spectra of gamma-ray bursts at high energies

Physics

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Energy Spectra, Gamma Ray Bursts, High Energy Interactions, Spectral Emission, Conservation Laws, Gamma Ray Spectrometers, Pair Production, Photons, Power Series, Solar Maximum Mission

Scientific paper

Between 1980 February and 1983 August the Gamma Ray Spectrometer (GRS) on the Solar Maximum Mission satellite (SMM) observed 71 gamma ray bursts. These events form a representative subset of the class of classical gamma ray bursts. Since their discovery more than 15 years ago, hundreds of gamma ray bursts have been detected; however most observations have been limited to an energy range of roughly 30 keV to 1 MeV. The large sensitive area and spectral range of the GRS allow, for the first time, and investigation of high energy (>1MeV) behavior of a substantial number of gamma ray bursts. It is found that high energy emission is seen in a large fraction of all events and that the data are consistent with all bursts emitting to at least 5 MeV with no cut offs. Further, no burst spectrum measured by GRS has a clear high energy cut off. The high energy emission can be a significant part of the total burst energy; on the average about 30% of the observed energy above 30 keV is contained in the > 1 MeV photons. Tests of spectral models yield mixed results. Neither a power law nor a thermal model can adequately explain all of the observed spectra.

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