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We perform calorimetry on the bright gamma ray burst (GRB) 030329 by fittingsimultaneously the broadband radio afterglow and the observed afterglow imagesize to a semi-analytic magnetohydrodynamical (MHD) and afterglow emissionmodel. Our semi-analytic method is valid in both the relativistic andnon-relativistic regimes, and incorporates a model of the interstellarscintillation that substantially effects the broadband afterglow below 10 GHz.The model is fitted to archival measurements of the afterglow flux from 1 dayto 8.3 years after the burst. Values for the initial burst parameters aredetermined and the nature of the circumburst medium is explored. Additionally,direct measurements of the lateral expansion rate of the radio afterglow imagesize allow us to estimate the initial Lorentz factor of the jet.

Calorimetry of GRB 030329: Simultaneous Fitting to the Broadband Radio Afterglow and the Observed Image Expansion Rate