Other
Scientific paper
Aug 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010noao.prop..213t&link_type=abstract
NOAO Proposal ID #2010B-0213
Other
Scientific paper
Rapid observations of gamma-ray bursts are critical to probing their exotic physics and using GRBs themselves as probes of the universe. Our collaboration has recently found the most distant known object, GRB 090423 at z=8.2, and continues to use Gemini (supported by other facilities) to study distant and extreme bursts, and explore the diversity of their hosts and progenitors. Our approach to both study individual key events, and build up statistical samples. Primary goals remain (i) to observe GRBs at very high redshifts, where they provide luminous backlights with which to explore the early ISM/IGM, and also the means to identify and characterise their faint hosts; (ii) to detect afterglows and measure redshifts for the class of short-duration bursts, whose nature, despite recent breakthroughs, remains enigmatic; (iii) to construct a more complete redshift sample of GRBs and constrain the evolution of the mass-metallicity relation; (iv) in conjunction with X-ray and gamma-ray data, to test the standard jetted, relativistic fireball models and to explore the connection between long-duration gamma-ray bursts and the core-collapse events that accompany them.
Bersier David
Fruchter Andrew
Graham John
Hjorth Jens
Jakobsson Páll
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