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Radio emission from the unusual supernova 1998bw and its association with the γ-ray burst of 25 April 1998

Kulkarni, S. R. and Frail, D. A. and Wieringa, M. H. and Ekers, R. D. and Sadler, E. M. and Wark, R. M. and Higdon, J. L. and Phinney, E. S. and Bloom, J. S. (1998) Radio emission from the unusual supernova 1998bw and its association with the γ-ray burst of 25 April 1998. Nature, 395 (6703). pp. 663-669. ISSN 0028-0836. doi:10.1038/27139.

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Data accumulated over the past year strongly favour the idea that γ-ray bursts lie at cosmological distances, although the nature of the power source remains unclear. Here we report radio observations of the supernova SN1998bw, which exploded at about the same time, and in about the same direction, as the γ-ray burst GRB980425. At its peak, the supernova was unusually luminous at radio wavelengths. A simple interpretation of the data requires that the source expanded with an apparent velocity of at least twice the speed of light, indicating that the supernova was accompanied by a shock wave moving at relativistic speeds (the ejects of supernovae are typically characterized by non-relativistic velocities). The energy of the shock is at least 10^(49)erg, with an inferred ejecta mass of 10^(-5) solar masses, and we suggest that the early phase of this shock wave produced the burst of γ-rays. Although in general the properties of supernovae are very different from those of γ-ray bursts, we argue that this unusual supernova establishes a second class of γ-ray burst, which is distinctly different from the cosmological kind.

Item Type:Article
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URLURL TypeDescription ReadCube access
Kulkarni, S. R.0000-0001-5390-8563
Higdon, J. L.0000-0003-1397-0586
Bloom, J. S.0000-0002-7777-216X
Additional Information:© 1998 Macmillan Publishers Ltd. Received 30 June 1998; Accepted 10 September 1998. We thank L. Avery and G. Moriarty-Schieven for help in making the JCMT observations. D.A.F. and S.R.K. thank M. Rupen, M. Rees and B. Paczynski for discussions. S.R.K. thanks A. Readhead for extensive discussions of brightness temperature. The Australia Telescope is funded by the Commonwealth of Australia for operation as a National Facility managed by CSIRO. The James Clerk Maxwell Telescope is operated by The Joint Astronomy Centre on behalf of the Particle Physics and Astronomy Research council of the United Kingdom, the Netherlands Organization for Scientific Research, and the National Research Council of Canada. The VLA is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. The research of S.R.K. and E.S.P. is supported by the National Science Foundation and NASA.
Group:UNSPECIFIED, Division of Geological and Planetary Sciences
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Issue or Number:6703
Record Number:CaltechAUTHORS:20130419-102428089
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Official Citation:Radio emission from the unusual supernova 1998bw and its association with the bold gamma-ray burst of 25 April 1998 p663 S. R. Kulkarni, D. A. Frail, M. H. Wieringa, R. D. Ekers, E. M. Sadler, R. M. Wark, J. L. Higdon, E. S. Phinney and J. S. Bloom doi:10.1038/27139
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:38033
Deposited By: Ruth Sustaita
Deposited On:23 Apr 2013 16:21
Last Modified:09 Nov 2021 23:33

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