A very energetic supernova associated with the γ-ray burst of 29 March 2003.

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Title:	A very energetic supernova associated with the γ-ray burst of 29 March 2003.
Authors:	Hjorth, Jens, Sollerman, Jesper, Moller, Palle, Fynbo, Johan P. U., Woosley, Stan E., Kouveliotou, Chryssa, Tanvir, Nial R., Greiner, Jochen, Andersen, Michael I., Castro-Tirado, Alberto J., Castro Ceron, Jose Maria, Fruchter, Andrew S., Gorosabel, Javier, Jakobsson, Pall, Kaper, Lex, Klose, Sylvio, Masetti, Nicola, Pedersen, Holger, Pedersen, Kristian, Pian, Elena
Source:	Nature. 6/19/2003, Vol. 423 Issue 6942, p847-850. 4p. 2 Charts, 3 Graphs.
Subjects:	Gamma ray bursts, Gamma ray astronomy, Supernovae, Supergiant stars, Star formation, Cataclysmic variable stars, Astronomical observations, Galaxies, X-ray bursts
Abstract:	Over the past five years evidence has mounted that long-duration (>2 s) γ-ray bursts (GRBs)-the most luminous of all astronomical explosions-signal the collapse of massive stars in our Universe. This evidence was originally based on the probable association of one unusual GRB with a supernova¹, but now includes the association of GRBs with regions of massive star formation in distant galaxies2,3, the appearance of supernova-like 'bumps' in the optical afterglow light curves of several bursts4-6 and lines of freshly synthesized elements in the spectra of a few X-ray afterglows7. These observations support, but do not yet conclusively demonstrate, the idea that long-duration GRBs are associated with the deaths of massive stars, presumably arising from core collapse. Here we report evidence that a very energetic supernova (a hypernova) was temporally and spatially coincident with a GRB at redshift z = 0.1685. The timing of the supernova indicates that it exploded within a few days of the GRB, strongly suggesting that core-collapse events can give rise to GRBs, thereby favouring the 'collapsar' model8,9. [ABSTRACT FROM AUTHOR]
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Database:	Psychology and Behavioral Sciences Collection

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Abstract:	Over the past five years evidence has mounted that long-duration (>2 s) γ-ray bursts (GRBs)-the most luminous of all astronomical explosions-signal the collapse of massive stars in our Universe. This evidence was originally based on the probable association of one unusual GRB with a supernova¹, but now includes the association of GRBs with regions of massive star formation in distant galaxies2,3, the appearance of supernova-like 'bumps' in the optical afterglow light curves of several bursts4-6 and lines of freshly synthesized elements in the spectra of a few X-ray afterglows7. These observations support, but do not yet conclusively demonstrate, the idea that long-duration GRBs are associated with the deaths of massive stars, presumably arising from core collapse. Here we report evidence that a very energetic supernova (a hypernova) was temporally and spatially coincident with a GRB at redshift z = 0.1685. The timing of the supernova indicates that it exploded within a few days of the GRB, strongly suggesting that core-collapse events can give rise to GRBs, thereby favouring the 'collapsar' model8,9. [ABSTRACT FROM AUTHOR]
ISSN:	00280836
DOI:	10.1038/nature01750