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28 March 2024
 
  » arxiv » astro-ph/9806333

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Gamma-ray bursts: postburst evolution of fireballs
Y.F. Huang ; Z.G. Dai ; D.M. Wei ; & T. Lu ;
Date 25 Jun 1998
Journal Mon.Not.Roy.Astron.Soc. 298 (1998) 459
Subject astro-ph
AffiliationNanjing Univ.,China), D.M. Wei(Purple Mountain Observatory, China), & T. Lu(Nanjing Univ.,China
AbstractThe postburst evolution of fireballs that produce $gamma$-ray bursts is studied, assuming the expansion of fireballs to be adiabatic and relativistic. Numerical results as well as an approximate analytic solution for the evolution are presented. Due to adoption of a new relation among $t$, $R$ and $gamma$ (see the text), our results differ markedly from the previous studies. Synchrotron radiation from the shocked interstellar medium is attentively calculated, using a convenient set of equations. The observed X-ray flux of GRB afterglows can be reproduced easily. Although the optical afterglows seem much more complicated, our results can still present a rather satisfactory approach to observations. It is also found that the expansion will no longer be highly relativistic about 4 days after the main GRB. We thus suggest that the marginally relativistic phase of the expansion should be investigated so as to check the afterglows observed a week or more later.
Source arXiv, astro-ph/9806333
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