The Source of Gamma Ray Bursts and the Nature of their Hosts

Details The Source of Gamma Ray Bursts and the Nature of their Hosts The Source of Gamma Ray Bursts and the Nature of their Hosts

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8189f&link_type=abstract

HST Proposal ID #8189

Mathematics

Logic

Hst Proposal Id #8189 Distant Galaxies

Scientific paper

We propose to use the unique high-resolution optical and ultraviolet capabilities of HST to investigate the physics of gamma-ray bursts {GRBs} and the nature of their host galaxies. Our approach is three-pronged: 1] rapid ultraviolet spectroscopy obtained within days of several outbursts will allow us to probe the physics of the relativistic fireball and constrain the density of the surrounding medium and the dust extinction in the host to the fireball, and in many cases will provide the redshift of the GRB; 2] ultraviolet spectroscopy and imaging will allow us to obtain redshifts of host galaxies which cannot be found by Keck or the VLT {due to a lack of strong visible lines in the redshift range 1.3 < z < 2.4}, permitting us to measure the rate of GRBs as a function of cosmological time; 3] optical images of the hosts taken both shortly after outburst and up to a year later will permit a study of the morphology of the hosts, determination of the position of the burst on t he host to 100 pc accuracy, and e x amination of the late time behavior of the afterglow. The morphology and astrometry will provide a crucial discriminant between models for the creation of GRBs; the long-term behavior of the light-curve probes the density of the host ISM and the energetics of the fireball. This comprehensive set of observations will provide new insights into the astrophysics of GRBs and their high redshift host galaxies.

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