Schedule Feb 07, 2006
Recent Radio Results on GRB Afterglows
Alicia Soderberg (Caltech)

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

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