The Broadband Afterglow of GRB 980329
Creators
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1.
Division of Physics
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2.
National Radio Astronomy Observatory
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3.
California Institute of Technology
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4.
East Asian Observatory
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Mount Stromlo Observatory
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6.
W.M. Keck Observatory
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7.
University of California, Los Angeles
Abstract
We present radio observations of the afterglow of the bright γ-ray burst GRB 980329 made between 1 month and several years after the burst, a reanalysis of previously published submillimeter data, and late-time optical and near-infrared (NIR) observations of the host galaxy. From the absence of a spectral break in the optical/NIR colors of the host galaxy, we exclude the earlier suggestion that GRB 980329 lies at a redshift of z ≳ 5. We combine our data with the numerous multiwavelength observations of the early afterglow, fit a comprehensive afterglow model to the entire broadband data set, and derive fundamental physical parameters of the blast wave and its host environment. Models for which the ejecta expand isotropically require both a high circumburst density and extreme radiative losses from the shock. No low-density model (n « 10 cm^(-3)) fits the data. A burst with a total energy of ~10^(51) ergs, with the ejecta narrowly collimated to an opening angle of a few degrees, driven into a surrounding medium with density of ~20 cm^(-3), provides a satisfactory fit to the light curves over a range of redshifts.
Additional Information
© 2002. The American Astronomical Society. Received 2002 April 4; accepted 2002 May 30. R. S. acknowledges support from the Fairchild Foundation and from a NASA ATP grant. J. S. B. acknowledges a grant from the Hertz foundation. Research with the Owens Valley Radio Telescope, operated by Caltech, is supported by NSF grant AST 96-13717.Attached Files
Published - pdf
Submitted - 0204141.pdf
Files
0204141.pdf
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Additional details
Identifiers
- Eprint ID
- 76329
- Resolver ID
- CaltechAUTHORS:20170408-172051331
Related works
- Describes
- https://arxiv.org/abs/astro-ph/0204141 (URL)
Funding
- Sherman Fairchild Foundation
- NASA
- Fannie and John Hertz Foundation
- NSF
- AST 96-13717
Dates
- Created
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2018-03-13Created from EPrint's datestamp field
- Updated
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2021-11-15Created from EPrint's last_modified field