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Oxford University Press (OUP), Monthly Notices of the Royal Astronomical Society, 4(394), p. 2164-2174

DOI: 10.1111/j.1365-2966.2009.14482.x

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Gamma‐ray burst afterglow scaling coefficients for general density profiles

Journal article published in 2009 by H. J. Van Eerten ORCID, R. A. M. J. Wijers
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

Gamma-ray burst (GRB) afterglows are well described by synchrotron emission originating from the interaction between a relativistic blast wave and the external medium surrounding the GRB progenitor. We introduce a code to reconstruct spectra and light curves from arbitrary fluid configurations, making it especially suited to study the effects of fluid flows beyond those that can be described using analytical approximations. As a check and first application of our code, we use it to fit the scaling coefficients of theoretical models of afterglow spectra. We extend earlier results of other authors to general circumburst density profiles. We rederive the physical parameters of GRB 970508 and compare with other authors.