Broadband Afterglow Observations of Fermi Gamma-Ray Bursts

Details Broadband Afterglow Observations of Fermi Gamma-Ray Bursts Broadband Afterglow Observations of Fermi Gamma-Ray Bursts

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21520704f&link_type=abstract

American Astronomical Society, AAS Meeting #215, #207.04; Bulletin of the American Astronomical Society, Vol. 42, p.310

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Scientific paper

We present radio and optical observations of those events which were detected with both the LAT and GBM on Fermi and which have spectroscopic redshifts. The high energy bandpass of Fermi makes it particularly well-suited for identifying gamma-ray bursts (GRB) with high isotropic radiated energies. Such events are likely to be either highly beamed or hyper-energetic (>>10**51 erg), and so provide strong tests of existing GRB progenitor models. When our radio and optical data are combined with X-ray data we are able to fit broadband afterglow models. Among other parameters, these models constrain the collimation angle and hence beaming-corrected energy release for each event. We will discuss these results and compare them to the larger sample of GRB afterglows.

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