Short Gamma-Ray Bursts observed by PHEBUS |
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Authors: | J -P Dezalay C Barat R Talon O Terekhov R Sunyaev A Kuznetsov |
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Institution: | (1) Centre d'Etude Spatiale des Rayonnements (CNRS/UPS), BP 4346, 31029 Toulouse Cedex, France;(2) Space Research Institute, Profsoyuznaya 84/32, 117810 Moscow, Russia |
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Abstract: | Statistical studies of Gamma-Ray Burst (GRB) properties have recently led to the discovery of a subclass within the population of classical events (Dezalayet al. 1992, Kouveliotouet al. 1993). Bursts belonging to this subclass are characterized by short durations, typically less than 2 seconds, and harder spectra on average. Using the PHEBUS GRB data set, we analyse the distributions of peak intensity, hardness ratio, and duration of the two subclasses. We also compare the sum spectra obtained with the brightest events to determine the ratio of total energies observed for each population. |
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Keywords: | Gamma-Ray Bursts |
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