Log-Normal Distributions in Gamma-Ray Burst Time Histories

Details Log-Normal Distributions in Gamma-Ray Burst Time Histories Log-Normal Distributions in Gamma-Ray Burst Time Histories

1996-07-25

arxiv.org/abs/astro-ph/9607131v1

Astronomy and Astrophysics

Astrophysics

4 figures, AASTeX, to appear in ApJ Letters

Scientific paper

10.1086/310275

We propose a new, simple but powerful algorithm to analyze the gamma-ray burst temporal structures based on identifying non-statistical variations (``peaks'') in the time histories. Detailed analyses of the bursts from the third BATSE catalog show that $\sim 30$ bursts have more than 20 peaks individually. Upon identifying most of the peaks in those bursts, we show that the peak fluence $S_i$ and peak interval $\delta_i$ distributions within each burst are consistent with log-normal distributions. Furthermore, we show that Gaussian (in linear space) and power-law distributions for peak fluences are ruled out, as is the Poisson distribution for peak intervals.

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