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19 April 2024

» arxiv » astro-ph/0203391

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Detection of a supernova signature associated with GRB 011121
J. S. Bloom ; S. R. Kulkarni ; P. A. Price ; D. Reichart ; T. J. Galama ; B. P. Schmidt ; D. A. Frail ; E. Berger ; P. J. McCarthy ; R. A. Chevalier ; J. C. Wheeler ; J. P. Halpern ; D. W. Fox ; S. G. Djorgovski ; F. A. Harrison ; R. Sari ; T. S. Axelrod ; R. A. Kimble ; J. Holtzman ; K. Hurley ; F. Frontera ; L. Piro ; E. Costa ;
Date:	22 Mar 2002
Journal:	Astrophys.J. 572 (2002) L45-L49
Subject:	astro-ph
Abstract:	Using observations from an extensive monitoring campaign with the Hubble Space Telescope we present the detection of an intermediate-time flux excess which is redder in color relative to the afterglow of GRB 011121, currently distinguished as the gamma-ray burst with the lowest known redshift. The red ``bump,’’ which exhibits a spectral roll-over at ~7200 Angstrom, is well described by a redshifted Type Ic supernova that occurred approximately at the same time as the gamma-ray burst event. The inferred luminosity is about half that of the bright supernova 1998bw. These results serve as compelling evidence for a massive star origin of long-duration gamma-ray bursts. Models that posit a supernova explosion weeks to months preceding the gamma-ray burst event are excluded by these observations. Finally, we discuss the relationship between spherical core-collapse supernovae and gamma-ray bursts.
Source:	arXiv, astro-ph/0203391
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