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The Broadband Afterglow of GRB 980329

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.

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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.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Harrison, F. A.0000-0003-2992-8024
Sari, R.0000-0002-1084-3656
Reichart, D.0000-0002-5060-3673
Bloom, J. S.0000-0002-7777-216X
Kulkarni, S. R.0000-0001-5390-8563
Djorgovski, S. G.0000-0002-0603-3087
Larkin, J. E.0000-0001-7687-3965
Walter, F.0000-0003-4793-7880
Fox, D. W.0000-0002-3714-672X
Taylor, G. B.0000-0001-6495-7731
Berger, E.0000-0002-9392-9681
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.
Funding AgencyGrant Number
Sherman Fairchild FoundationUNSPECIFIED
Fannie and John Hertz FoundationUNSPECIFIED
NSFAST 96-13717
Subject Keywords:galaxies: high-redshift; gamma rays: bursts
Issue or Number:1
Record Number:CaltechAUTHORS:20170408-172051331
Persistent URL:
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
Deposited By: 1Science Import
Deposited On:13 Mar 2018 20:02
Last Modified:15 Nov 2021 16:59

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