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26 April 2024 |
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The afterglow of GRB050709 and the nature of the short-hard gamma-ray bursts | | D. B. Fox
; D. A. Frail
; P. A. Price
; S. R. Kulkarni
; E. Berger
; T. Piran
; A. M. Soderberg
; S. B. Cenko
; P. B. Cameron
; A. Gal-Yam
; M. M. Kasliwal
; D.-S. Moon
; F. A. Harrison
; E. Nakar
; B. P. Schmidt
; B. Penprase
; R. A. Chevalier
; P. Kumar
; K. Roth
; D. Watson
; B. L. Lee
; S. Shectman
; M. M. Phillips
; M. Roth
; P. J. McCarthy
; M. Rauch
; L. Cowie
; B. A. Peterson
; J. Rich
; N. Kawai
; K. Aoki
; G. Kosugi
; T. Totani
; H.-S. Park
; A. MacFadyen & K. C. Hurley
; | | Date: |
5 Oct 2005 | | Subject: | astro-ph | | Abstract: | The final chapter in the long-standing mystery of the gamma-ray bursts (GRBs) centres on the origin of the short-hard class, suspected on theoretical grounds to result from the coalescence of neutron star or black hole binary systems. Numerous searches for the afterglows of short-hard bursts have been made, galvanized by the revolution in our understanding of long-duration GRBs that followed the discovery in 1997 of their broadband (X-ray, optical, and radio) afterglow emission. Here we present the discovery of the X-ray afterglow of a short-hard burst whose accurate position allows us to unambiguously associate it with a star-forming galaxy at redshift z=0.160, and whose optical lightcurve definitively excludes a supernova association. Together with results from three other recent short-hard bursts, this suggests that short-hard bursts release much less energy than the long-duration GRBs. Models requiring young stellar populations, such as magnetars and collapsars, are ruled out, while coalescing degenerate binaries remain the most promising progenitor candidates. | | Source: | arXiv, astro-ph/0510110 | | Services: | Forum | Review | PDF | Favorites | |
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