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Gamma-ray burst beaming: a universal configuration with a standard energy reservoir?

Authors
  • Zhang, Bing
  • Meszaros, Peter
Type
Published Article
Publication Date
Feb 01, 2002
Submission Date
Dec 05, 2001
Identifiers
DOI: 10.1086/339981
arXiv ID: astro-ph/0112118
Source
arXiv
License
Unknown
External links

Abstract

We consider a gamma-ray burst (GRB) model based on an anisotropic fireball with an axisymmetric power-law distribution of the energy per solid angle with index -k, and allow for the observer's viewing direction being at an arbitrary angle with respect to the jet axis. This model can reproduce the key features expected from the conventional on-axis uniform jet models, with the novelty that the achromatic break time in the broadband afterglow lightcurves corresponds to the epoch when the relativistic beaming angle is equal to the viewing angle rather than to the jet half opening angle. If all the GRB fireballs have such a similar energy distribution form with 1.5 < k < (or \sim) 2, GRBs may be modeled by a quasi-universal beaming configuration, and an approximately standard energy reservoir. The conclusion also holds for some other forms of angular energy distributions, such as the Gaussian function.

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