Other
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21722305p&link_type=abstract
American Astronomical Society, AAS Meeting #217, #223.05; Bulletin of the American Astronomical Society, Vol. 43, 2011
Other
Scientific paper
After 6 years of operation, Swift has significantly advanced our physical understanding of gamma-ray bursts (GRBs) but it has also raised fundamental questions about the origin of the prompt emission, the nature of the central engine, and the character the relativistic outflow (i.e. composition, collimation, energy release, etc.) Sensitive radio measurements of GRB afterglow may play crucial role here. Radio afterglow measurements are useful for determining GRB energetics in two distinct ways. First, the signature of a jet break in a radio light curve is distinct but different than that seen in optical or X-ray light curves and is less affected by systematics. Thus the jet geometry information coming from radio data is quite robust. Radio data is most powerful when modeled as part of the multi-wavelength dataset. This gives us a reliable method to derive the blast wave kinetic energy and the density of the circumburst medium. Second, if the afterglow is bright enough, the radio data offers a unique way of determining the late-time GRB calorimetry. Our group has observed several hundred GRBs in radio band with the VLA. Here I will talk about how these radio observations combined with other multiwaveband observations have increased our overall understanding towards the GRB Physics. Reverse shocks seen in some radio afterglows have given us new insights in early Physics of GRBs. Towards the end I will talk about the existing loopholes in our understanding of GRB phenomenon and how the upcoming telescopes such as EVLA and ALMA will fill these gaps.
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