Peak Energy-Isotropic Energy Relation in the Off-Axis Gamma-Ray Burst Model

Details Peak Energy-Isotropic Energy Relation in the Off-Axis Gamma-Ray Burst Model Peak Energy-Isotropic Energy Relation in the Off-Axis Gamma-Ray Burst Model

2004-01-06

arxiv.org/abs/astro-ph/0401044v2

Astrophys.J. 606 (2004) L33-L36

Astronomy and Astrophysics

Astrophysics

11 pages, 2 eps figures

Scientific paper

10.1086/421084

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 HETE-2, and we find that they are similar.

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