Journal
ASTROPHYSICAL JOURNAL
Volume 606, Issue 1, Pages L33-L36Publisher
IOP PUBLISHING LTD
DOI: 10.1086/421084
Keywords
gamma rays : bursts; gamma rays : theory
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Using a simple uniform jet model of prompt emissions of gamma-ray bursts (GRBs), we reproduce the observed peak energy - isotropic energy relation. A Monte Carlo simulation shows that the low isotropic energy part of the relation is dominated by events viewed from off-axis directions, and the number of the off-axis events is about one-third of the on-axis emissions. We also compute the observed event rates of the GRBs, the X-ray - rich GRBs, and the X-ray flashes detected by High Energy Transient Explorer 2, and we find that they are similar.
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