The distances of short-hard GRBs and the SGR connection

Details The distances of short-hard GRBs and the SGR connection The distances of short-hard GRBs and the SGR connection

2005-02-08

arxiv.org/abs/astro-ph/0502148v2

Astrophys.J.640:849-853,2006

Astronomy and Astrophysics

Astrophysics

Enlarged sample of bursts; ApJ in press

Scientific paper

10.1086/498229

We present a search for nearby (D<100 Mpc) galaxies in the error boxes of six well-localized short-hard gamma-ray bursts (GRBs). None of the six error boxes reveals the presence of a plausible nearby host galaxy. This allows us to set lower limits on the distances and, hence, the isotropic-equivalent energy of these GRBs. Our lower limits are around $1 \times 10^{49}$ erg (at $2\sigma$ confidence level); as a consequence, some of the short-hard GRBs we examine would have been detected by BATSE out to distances greater than 1 Gpc and therefore constitute a bona fide cosmological population. Our search is partially motivated by the December 27, 2004 hypergiant flare from SGR 1806-20, and the intriguing possibility that short-hard GRBs are extragalactic events of a similar nature. Such events would be detectable with BATSE to a distance of \~50 Mpc, and their detection rate should be comparable to the actual BATSE detection rate of short-hard GRBs. The failure of our search, by contrast, suggests that such flares constitute less than 15% of the short-hard GRBs (<40% at 95% confidence). We discuss possible resolutions of this discrepancy.

Affiliated with

Also associated with

No associations

Rating

The distances of short-hard GRBs and the SGR connection does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The distances of short-hard GRBs and the SGR connection, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The distances of short-hard GRBs and the SGR connection will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-721866