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

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arxiv 0906.3193 v1 pith:ONU7DEXN submitted 2009-06-17 astro-ph.HE

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

T. N. Ukwatta , K. S. Dhuga , W. C. Parke , T. Sakamoto , C. B. Markwardt , S. D. Barthelmy , D. F. Cioffi , A. Eskandarian
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N. Gehrels L. Maximon D. C. Morris
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classification astro-ph.HE
keywords variabilitytimeburstsemissionfrequencygamma-raygrbsscale
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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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