منابع مشابه
The Short Burst Revolution
Gamma-ray bursts (GRBs) are among the most energetic explosions in the Universe. They are generally divided into two main classes: long duration-soft spectrum bursts, which last ~2 to hundreds of seconds; and, short duration-hard GRBs, which last less than 2 seconds and are spectrally “harder” than the first class. Over the past few years, the long-soft GRBs have been shown to be associated wit...
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The demonstration of repeated gamma-ray bursts from an individual source would severely constrain burst source models. Recent reports (Quashnock and Lamb 1993; Wang & Lingenfelter 1993; Ryan et al. 1994) of evidence for repetition in the first BATSE burst catalog have generated renewed interest in this issue. Here, we analyze the angular distribution of 585 bursts of the second BATSE catalog (M...
متن کاملTwo-component Jet Models of Gamma-ray Burst Sources
Recent observational and theoretical studies have raised the possibility that the collimated outflows in gamma-ray burst (GRB) sources have two distinct components: a narrow (opening half-angle θj,n), highly relativistic (initial Lorentz factor ηn & 10 ) outflow, from which the γ-ray emission originates, and a wider (θj,w . 3 θj,n), moderately relativistic (ηw ∼ 10) surrounding flow. Using a si...
متن کاملEmission Spectra from Internal Shocks in Gamma-Ray-Burst Sources
Unsteady activity of γ-ray burst sources leads to internal shocks in their emergent relativistic wind. We study the emission spectra from such shocks, assuming that they produce a power-law distribution of relativistic electrons and posses strong magnetic fields. The synchrotron radiation emitted by the accelerated electrons is Compton up-scattered multiple times by the same electrons. A substa...
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ژورنال
عنوان ژورنال: Nature
سال: 2005
ISSN: 0028-0836,1476-4687
DOI: 10.1038/437822a