Radio afterglows of gamma ray bursts

Poonam Chandra1* and Dale A. Frail2
1NCRA-TIFR, Pune University Campus, Ganeshkhind, Pune 411007, India
2National Radio Astronomy Observatory, Socorro, NM 87801, USA

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Radio observations of Gamma Ray Burst (GRB) afterglows are excellent means to probe the GRB environments and constrain their density. Late time radio observations of a GRB afterglow, when it has made transition to non-relativistic phase, can provide most accurate energy estimate independent of the jet geometry. Radio emission also allows us to see late time important transitions in the afterglow physics, which in turn provide key diagnostics to the fundamental parameters of the explosion. Here we will present a statistical analysis of GRB afterglows and derive important conclusions and predictions about their detectability in radio bands.

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Keywords : radiation mechanisms: non-thermal – shock waves – gammarays: bursts – radio continuum: general