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On the Fast Spectral Variability of GRBs



Abstract. Fast spectral variability of gamma-ray burst emission is considered for a number of events seen by the Konus-Wind experiment. The variability manifests itself as a strong correlation between instantaneous energy flux F and peak energy Ep. In the (F, Ep) plane, the correlation produces distinct tracks in the form of branches and loops representing the different parts of a burst time history. Despite the variety of features seen in different events, the main characteristics of the spectral evolution produce a quite consistent pattern. The temporal evolution of GRB energy spectra has been clearly seen in first experiments with sufficient spectral and time resolution. Some characteristics of spectral evolution were pointed out in the Konus experiment aboard Venera 11 and Venera 12 [1]. Observations on Venera 13 and 14 revealed a strong correlation between instantaneous intensity and hardness of a radiation [2]. Then, many authors considered different aspects of spectral evolution of gamma-ray bursts [3,4]. The BATSE experiment aboard the CGRO offers a wealth of spectroscopic information permitting a rich study of the variability and related correlations i

Year: 2001
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