Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-02-23
Astronomy and Astrophysics
Astrophysics
3 pages, to appear in "Gamma-Ray Burst in the Afterglow Era: 2nd Workshop" Rome - Italy October 17-20, 2000
Scientific paper
10.1007/10853853_22
We find and study a variety of the spectral-temporal behavior during the decay phase of the light curve of long and bright pulse structures in gamma-ray bursts. It was earlier found that for about half of these decays, the instantaneous photon flux is consistent with a power law in time, where the photon flux $\propto$ 1/time. This decay behavior is a consequence of the validity of both a power law hardness-intensity correlation (HIC) and an exponential hardness-fluence correlation (HFC). Beside this behavior, we find that the other cases approximately behave as 1/(time)$^3$. For a few of these latter decays, the two correlations (HIC and HFC) are constrained and found to be consistent with the light curve behavior. For these cases, the HIC is still a power law while the HFC is described by a generalized function. We study and describe these behaviors analytically and examine actual burst data from the complete catalog of the BATSE on the CGRO.
Ryde Felix
Svensson Roland
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