Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20919404n&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #194.04; Bulletin of the American Astronomical Society,
Astronomy and Astrophysics
Astronomy
Scientific paper
The detection of short GRB afterglows, and the following host galaxy identifications, confirmed that the two observationally defined sub-classes, long and short GRBs, are distinctive physical phenomena. Following this observational breakthrough, the study of short GRBs progressed rapidly during the last year. I discuss theoretical conclusions that can be drawn from these recent observations on the relativistic emission source, such as constraints on its Lorentz factor and on the efficiency in which it produces gamma-rays. I also review the constraints on the nature of short GRB progenitors that can be derived using environmental properties (host galaxy types, redshift distribution, circum-burst medium density, etc.).
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