Intrinsic parameters of grb990123 from its prompt optical flash and afterglow - INSPIRE

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Intrinsic parameters of grb990123 from its prompt optical flash and afterglow

Jun, 1999

17 pages

Published in:

Mon.Not.Roy.Astron.Soc. 319 (2000) 1159

e-Print:

astro-ph/9906062 [astro-ph]

DOI:

10.1046/j.1365-8711.2000.03922.x

View in:

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Abstract: (arXiv)

We have constrained the intrinsic parameters, such as the magnetic energy density fraction (

\epsilon_{B}

), the electron energy density fraction (

\epsilon_e

), the initial Lorentz factor (

\Gamma_0

) and the Lorentz factor of the reverse external shock (

\Gamma_{rs}

), 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

\epsilon_e

and

\epsilon_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.

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Figures(0)

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