Analysis of Temporal Features of Gamma Ray Bursts in the Internal Shock Model

Details Analysis of Temporal Features of Gamma Ray Bursts in the Internal Shock Model Analysis of Temporal Features of Gamma Ray Bursts in the Internal Shock Model

1999-08-09

arxiv.org/abs/astro-ph/9908097v2

Astrophys.J. 537 (2000) 824-832

Astronomy and Astrophysics

Astrophysics

ApJ in press, 2000; with slight revisions; 12 pag, 6 fig

Scientific paper

10.1086/309048

In a recent paper we have calculated the power density spectrum of Gamma-Ray Bursts arising from multiple shocks in a relativistic wind. The wind optical thickness is one of the factors to which the power spectrum is most sensitive, therefore we have further developed our model by taking into account the photon down-scattering on the cold electrons in the wind. For an almost optically thick wind we identify a combination of ejection features and wind parameters that yield bursts with an average power spectrum in agreement with the observations, and with an efficiency of converting the wind kinetic energy in 50-300 keV emission of order 1%. For the same set of model features the interval time between peaks and pulse fluences have distributions consistent with the log-normal distribution observed in real bursts.

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