Physics
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9074f&link_type=abstract
HST Proposal ID #9074
Physics
Hst Proposal Id #9074 Galaxies
Scientific paper
The rapid and accurate localization of gamma-ray bursts {GRBs} promised by the launch of HETE-2 will revolutionize our ability to study these enigmatic but highly luminous objects. We propose a program of HST and Chandra observations to capitalize on this extraordinary opportunity. The association of GRBs to star-forming galaxies now appears strong, in part because of our successful HST-based observing programs. We propose new observations that will provide the most stringent tests yet performed of the hypothesis that GRBs are powered by the collapse of massive stars. We will use STIS CCD spectroscopy to detect broad atomic features of supernovae underlying GRB optical transients, at flux levels more than a factor of three fainter than SN 1998bw. We will use UV, optical, and X-ray spectroscopy to study the local ISM around the GRB, testing whether GRBs preferentially occur in molecular clouds. Our broadband late-time imaging will further test physical models of the relativistic blast wave that produces the bright GRB afterglow, and together with our early spectroscopy will provide unique insight into the relationship between the behavior of the afterglow and the environment of the burster.
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