Yost, S. A. and Frail, D. A. and Harrison, F. A. and Sari, R. and Reichart, D. and Bloom, J. S. and Kulkarni, S. R. and Moriarty-Schieven, G. H. and Djorgovski, S. G. and Price, P. A. and Goodrich, R. W. and Larkin, J. E. and Walter, F. and Shepherd, D. S. and Fox, D. W. and Taylor, G. B. and Berger, E. and Galama, T. J. (2002) The Broadband Afterglow of GRB 980329. Astrophysical Journal, 577 (1). pp. 155-163. ISSN 0004-637X. doi:10.1086/342175. https://resolver.caltech.edu/CaltechAUTHORS:20170408-172051331
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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.
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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. | ||||||||||||||||||||||||
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Subject Keywords: | galaxies: high-redshift; gamma rays: bursts | ||||||||||||||||||||||||
Issue or Number: | 1 | ||||||||||||||||||||||||
DOI: | 10.1086/342175 | ||||||||||||||||||||||||
Record Number: | CaltechAUTHORS:20170408-172051331 | ||||||||||||||||||||||||
Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20170408-172051331 | ||||||||||||||||||||||||
Official Citation: | S. A. Yost et al 2002 ApJ 577 155 | ||||||||||||||||||||||||
Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||||||||||||||||||||
ID Code: | 76329 | ||||||||||||||||||||||||
Collection: | CaltechAUTHORS | ||||||||||||||||||||||||
Deposited By: | 1Science Import | ||||||||||||||||||||||||
Deposited On: | 13 Mar 2018 20:02 | ||||||||||||||||||||||||
Last Modified: | 15 Nov 2021 16:59 |
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