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The optical afterglow of the short gamma-ray burst GRB 050709 | | Jens Hjorth
; Darach Watson
; Johan P. U. Fynbo
; Paul A. Price
; Brian L. Jensen
; Uffe G. J{o}rgensen
; Daniel Kubas
; Javier Gorosabel
; Páll Jakobsson
; Jesper Sollerman
; Kristian Pedersen
; Chryssa Kouveliotou
; | | Date: |
4 Oct 2005 | | Journal: | Nature 437 (2005) 859-861 DOI: 10.1038/nature04174 | | Subject: | astro-ph | | Abstract: | It has long been known that there are two classes of gamma-ray bursts (GRBs), mainly distinguished by their durations. The breakthrough in our understanding of long-duration GRBs (those lasting more than ~2 s), which ultimately linked them with energetic Type Ic supernovae, came from the discovery of their long-lived X-ray and optical afterglows, when precise and rapid localizations of the sources could finally be obtained. X-ray localizations have recently become available for short (duration <2 s) GRBs, which have evaded optical detection for more than 30 years. Here we report the first discovery of transient optical emission (R-band magnitude ~23) associated with a short burst; GRB 050709. The optical afterglow was localized with subarcsecond accuracy, and lies in the outskirts of a blue dwarf galaxy. The optical and X-ray afterglow properties 34 h after the GRB are reminiscent of the afterglows of long GRBs, which are attributable to synchrotron emission from ultrarelativistic ejecta. We did not, however, detect a supernova, as found in most nearby long GRB afterglows, which suggests a different origin for the short GRBs. | | Source: | arXiv, astro-ph/0510096 | | Services: | Forum | Review | PDF | Favorites | |
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