The Astrophysics of the Most Energetic Gamma-Ray Bursts

Details The Astrophysics of the Most Energetic Gamma-Ray Bursts The Astrophysics of the Most Energetic Gamma-Ray Bursts

Jul 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009hst..prop12370f&link_type=abstract

HST Proposal ID #12370. Cycle 18

Physics

Scientific paper

The Large Area Telescope {LAT} of Fermi has found a sample of highly relativistic gamma-ray bursts {GRBs}, which may be among the most energetic bursts ever discovered. Here we propose to use Chandra and HST to follow the late time X-ray and optical light curves of a LAT detected burst that also has excellent early multiwavelength coverage. Our observations, in conjunction with the Fermi data, will allow us to measure the energy and the bulk Lorentz factor of the explosion. Recent work on some of the most powerful GRBs begins to substantially constrain physical models of the progenitors. The energetics of the highly relativistic LAT bursts may greatly strengthen these constraints and provide new insight into the currently unknown mechanism that determines the energy in a GRB.;

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