Frequency of fast, narrow gamma-ray bursts and burst classification

Computer Science

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X-Ray Sources, X-Ray Bursts, Spectroscopy And Spectrophotometry

Scientific paper

Evidence from the Vela satellites 1 that very brief, ~0.1 s, gamma-ray bursts constitute a class distinct from the longer, highly structured bursts has been strengthened by the results of the Venera 11 and 12 KONUS experiments 2. The Goddard ISEE-3 Gamma-Ray Burst Spectrometer, utilizing a trigger criterion which is more likely to be independent of duration than previous experiments, has detected a sample of events which enhances this bimodal distribution. The ISEE-3 result is corroborated by an increase in the frequency of detection of short bursts in the KONUS 13/14 database over KONUS 11/12, an effect attributable to the use of a shorter trigger integration time in the later experiments. Considerations such as repeating bursters complicate a simple dichotomous classification of gamma-ray bursts.

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