Recent Radio Results on GRB Afterglows

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Scientific paper

With the launch of the Swift satellite in 2004, great strides have beenmade toward understanding the once mysterious gamma-raybursts. By studying their X-ray, optical and radio afterglows, we have beenable to derive the energy of the explosion, the geometry of theoutflow, the density structure of the circumburst medium, and theproperties of their host galaxies. Although many questions remainunanswered, a basic picture is beginning to emerge in which long-durationgamma-ray bursts originate from the birth of a black hole. The subsequentexplosion, with a typical energy of 10^51 erg, drives a highlycollimated, ultra-relativistic shock in thecircumburst medium with a density of order 1 cm-3. We now know that mostlong duration GRBs are also accompanied by a sub-relativisticquasi-spherical explosion which gives rise to a Type Ibc supernova. Inthis talk, I will illustrate how radio observations of GRB afterglows haveenabled this progress to be achieved. In addition I will discuss how radioobservations of local Type Ibc supernovae can be used as a unique tool toshed light on the GRB-SN connection. In particular, I will present theradio derived constraints on the energy coupled to relativistic ejecta fromour survey of 100 local SNe Ibc which impose severe constraints on theḧypernova\" model.

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