GRB 050509b

From Wikipedia, the free encyclopedia

GRB 050509b was a gamma ray burst (GRB) observed by the NASA Swift satellite on May 9, 2005. It was the first short duration GRB for which an accurate positional measurement was made, accurate enough to locate it near to an elliptical galaxy lying at a redshift of 0.225.

The significance of this finding is that it lends support to the theory that short bursts are formed during the catastrophic merger of two neutron stars, or a neutron star and a black hole. The orbital decay (via gravitational radiation) of stellar binaries consisting of these exotic compact objects is believed to take hundreds of millions of years, hence GRBs produced this way would be expected to be located in old (misleadingly called "early type") galaxies. In contrast, long-duration GRBs, which are believed to result from the collapse of a single massive star, are expected to be located preferentially in young galaxies.