Robert Mesler, Ylva Pihlström
We perform calorimetry on the bright gamma ray burst (GRB) GRB 030329 by fitting simultaneously the broadband radio afterglow and the observed afterglow image size to a semi-analytic magnetohydrodynamical (MHD) and afterglow emission model. Our semi-analytic method is valid at all relativistic regimes and is successfully used to fit archival measurements of the afterglow flux from 1 day to 5.5 years after the burst. Values for the initial burst parameters are determined and the nature of the circumburst medium is explored. Additionally, direct measurements of the lateral expansion rate of the radio afterglow image size allow us to independently estimate the initial Lorentz factor of the jet.
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http://arxiv.org/abs/1304.3858
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