GRB 050509B

GRB 050509B
Other designations GRB 050509B
Event type gamma-ray burst
Detection
Date 9 May 2005
Duration 40±4 millisecond
Instrument Swift Gamma-Ray Burst Mission
Location
Constellation Coma Berenices
Right ascension 12h 36m 13.9s
Declination +28° 59 01
Redshift 0.225±0.001
Energetics
See also

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 gamma ray bursts produced this way would be expected to be located in old (misleadingly called "early type") galaxies. In contrast, long-duration gamma ray bursts, which are believed to result from the collapse of a single massive star, are expected to be located preferentially in young galaxies.

References

This article is issued from Wikipedia - version of the Monday, February 15, 2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.