Intrinsic Parameters of GRB990123 from Its Prompt Optical Flash and Afterglow

X. Y. Wang; Z. G. Dai; T. Lu

doi:10.1046/j.1365-8711.2000.03922.x

paper

Intrinsic Parameters of GRB990123 from Its Prompt Optical Flash and Afterglow

arXiv:astro-ph/9906062 · doi:10.1046/j.1365-8711.2000.03922.x

Abstract

We have constrained the intrinsic parameters, such as the magnetic energy density fraction ( $ε_{B}$ ), the electron energy density fraction ( $ε_{e}$ ), the initial Lorentz factor ( $Γ_{0}$ ) and the Lorentz factor of the reverse external shock ( $Γ_{r s}$ ), of GRB990123, in terms of the afterglow information (forward shock model) and the optical flash information (reverse shock model). Our result shows: 1) the inferred values of $ε_{e}$ and $ε_{B}$ are consistent with the suggestion that they may be universal parameters, comparing to those inferred for GRB970508; 2) the reverse external shock may have become relativistic before it passed through the ejecta shell. Other instrinsic parameters of GRB990123, such as energy contained in the forward shock $E$ and the ambient density $n$ are also determined and discussed in this paper.

arXiv comment5 pages, MN LaTeX style, a few changes made according to referee's suggestions, references up dated, MNRAS accepted

Intrinsic Parameters of GRB990123 from Its Prompt Optical Flash and Afterglow

Abstract

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