Gamma-ray bursts: Temporal scales and the bulk lorentz factor

Sonbas, E. and Maclachlan, G. A. and Dhuga, K. S. and Veres, Péter and Shenoy, A. and Ukwatta, T. N. (2015) Gamma-ray bursts: Temporal scales and the bulk lorentz factor. ASTROPHYSICAL JOURNAL, 805 (2). ISSN 1538-4357

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Abstract

For a sample of Swift and Fermi GRBs, we show that the minimum variability timescale and the spectral lag of the prompt emission is related to the bulk Lorentz factor in a complex manner: For small Γ’s, the variability timescale exhibits a shallow (plateau) region. For large Γ’s, the variability timescale declines steeply as a function of Γ (δT ∝ Γ−4.05±0.64). Evidence is also presented for an intriguing correlation between the peak times, tp, of the afterglow emission and the prompt emission variability timescale.

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