Calorimetry of GRB afterglows -- a Direct Measure of the Fireball Energy

Details Calorimetry of GRB afterglows -- a Direct Measure of the Fireball Energy Calorimetry of GRB afterglows -- a Direct Measure of the Fireball Energy

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...201.8403b&link_type=abstract

American Astronomical Society, 201st AAS Meeting, #84.03; Bulletin of the American Astronomical Society, Vol. 34, p.1243

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Scientific paper

Radio observations of GRB afterglows allow us to trace the evolution of the afterglow to late times (t>1 year). As such, these observations directly measure the transition to non-relativistic velocities and the subsequent evolution. In this regime, we can use the simple Sedov-Taylor formulation to perform a direct calorimetry of the fireball, which is independent of geometric effects (i.e. beaming). Moreover, the early radio observations provide a direct measure of the size of the fireball via Interstellar Scintillation. This measurement is then combined with the non-relativistic evolution to provide an even more robust estimate of the fireball energy. In this talk I will demonstrate the unique advantage that this method provides over other estimates (e.g. using broad-band modeling), and I will place the energy measurements in the context of past results.

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