| Popis: |
We report the initial results of an analysis of 19 gamma‐ray burst energy spectra recorded by the Venera‐13 and 14 SIGNE experiments. The complete data‐base includes some 150 events, with 5 channel energy spectra taken in the 50–700 keV range with 0.5 s time resolution, for 64 s. The observed spectra of each event analyzed were fitted with a power law, bremsstrahlung, and thermal synchrotron model, for each time interval containing a statistically significant number of counts. Although specific examples may be found which exhibit hard‐to‐soft evolution, or a correlation between the effective temperature kT of a fit and the time history, cases of ‘‘random’’ spectral evolution are also present, and there appears to be no single way to characterize spectral evolution. There is also no clear preference for a particular model fit in the data analyzed so far. |
