Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-10-20
Astrophys.J. 519 (1999) 206
Astronomy and Astrophysics
Astrophysics
17 pages, 7 figure pages, 2 table pages, submitted to The Astrophysical Journal
Scientific paper
10.1086/307360
We have analyzed the evolution of the spectral hardness parameter Epk as a function of fluence in gamma-ray bursts. We fit 41 pulses within 26 bursts with the trend reported by Liang & Kargatis (1996) which found that Epk decays exponentially with respect to photon fluence. We also fit these pulses with a slight modification of this trend, where Epk decays linearly with energy fluence. In both cases, we found the set of 41 pulses to be consistent with the trend. For the latter trend, which we believe to be more physical, the distribution of the decay constant is roughly log-normal, with a mean of 1.75 +/- 0.07 and a FWHM of 1.0 +/- 0.1. Regarding an earlier reported invariance in the decay constant among different pulses in a single burst, we found probabilities of 0.49 to 0.84 (depending on the test used) that such invariance would occur by coincidence, most likely due to the narrow distribution of decay constant values among pulses.
Band David L.
Briggs Michael Stephen
Crider Anthony
Liang Edison P.
Matteson James L.
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