Characteristic Variability Time Scales of Long Gamma-Ray Bursts

Details Characteristic Variability Time Scales of Long Gamma-Ray Bursts Characteristic Variability Time Scales of Long Gamma-Ray Bursts

2003-01-28

arxiv.org/abs/astro-ph/0301553v2

Publ. Astron. Soc. Japan 55, pp345-349 (2003)

Astronomy and Astrophysics

Astrophysics

10 pages, 5 figures, corrected some typos and syntaxes, enlarged the label fonts in fig.3 and fig.5

Scientific paper

We determined the characteristic variability time scales (\Delta t_p) of 410 bright and long GRBs, by locating the peaks of their Power Density Spectra, defined and calculated in the time domain. We found that the averaged variability time scale decreases with the peak flux. This is consistent with the time-dilation effect expected for the cosmological origin of GRBs. We also found that the occurrence distribution of the characteristic variability time scale shows bimodality, which might be interpreted as that the long GRB sample is composed of two sub-classes with different variability time scales. However, we found no difference for some other characteristics of these two sub-classes.

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