Variability in the Prompt Emission of Swift-BAT Gamma-Ray Bursts

Details Variability in the Prompt Emission of Swift-BAT Gamma-Ray Bursts Variability in the Prompt Emission of Swift-BAT Gamma-Ray Bursts

2009-06-17

arxiv.org/abs/0906.3193v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

4 pages; Submitted to Proceedings of NS-GRB Conference in Egypt 2009 (4 pages, 5 figures)

Scientific paper

We present the results of our study of the variability time scales of a sample of 27 long Swift Gamma-Ray Bursts (GRBs) with known redshifts. The variability time scale can help our understanding of fundamental GRB parameters such as the initial bulk Lorentz factor and the characteristic size associated with the emission region. Fast Fourier Transform (FFT) techniques were used to extract a noise threshold crossing frequency, which we associate with a variability time scale. The threshold frequency appears to show a correlation with the peak isotropic luminosity of GRBs.

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