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Multicolor Observations of the GRB 000926 Afterglow

Price, P. A. and Harrison, F. A. and Galama, T. J. and Reichart, D. E. and Axelrod, T. S. and Berger, E. and Bloom, J. S. and Busche, J. and Cline, T. and Dierks, A. and Djorgovski, S. G. and Frail, D. A. and Gal-Yam, A. and Halpern, J. and Holtzman, J. A. and Hunt, M. and Hurley, K. and Jacoby, B. and Kimble, R. and Kulkarni, S. R. and Mirabal, N. and Morrison, G. and Ofek, E. and Pevunova, O. and Sari, R. and Schmidt, B. P. and Turnshek, D. and Yost, S. (2001) Multicolor Observations of the GRB 000926 Afterglow. Astrophysical Journal, 549 (1). L7-L10. ISSN 0004-637X. doi:10.1086/319152.

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We present multicolor light curves of the optical afterglow of gamma-ray burst (GRB) 000926. Beginning ~1.5 days after the burst, the light curves of this GRB steepen measurably. The existence of such achromatic breaks is usually taken to be an important observational signature that the ejecta are not expanding isotropically but rather have a collimated jetlike geometry. If we interpret the data in this context, we derive an opening angle of 5°, which reduces the energy release compared with an isotropic model by a factor of ~275, to 1.7x10^(51) ergs. To fit the data with a simple jet model requires extinction along the line of sight. The derived A_V is in the range 0.11–0.82 mag, depending on the adopted extinction law and whether the electrons giving rise to the optical emission are undergoing synchrotron cooling or not. Since this is in excess of the expected extinction from our Galaxy, we attribute this to the GRB host. We note that this extinction is typical of a galactic disk, and therefore the event likely took place in the disk of its host.

Item Type:Article
Related URLs:
URLURL TypeDescription DOIArticle
Harrison, F. A.0000-0003-2992-8024
Reichart, D. E.0000-0002-5060-3673
Berger, E.0000-0002-9392-9681
Bloom, J. S.0000-0002-7777-216X
Djorgovski, S. G.0000-0002-0603-3087
Gal-Yam, A.0000-0002-3653-5598
Kulkarni, S. R.0000-0001-5390-8563
Ofek, E.0000-0002-6786-8774
Sari, R.0000-0002-1084-3656
Schmidt, B. P.0000-0001-6589-1287
Additional Information:© 2001 The American Astronomical Society. Received 2000 December 13; accepted 2001 January 25; published 2001 February 26. We thank the staff of the Palomar, Keck, MDM, and Wise Observatories and also L. Cowie, A. Barger, R. Ellis, C. Steidel, and B. Madore for their assistance in obtaining observations. We thank E. Mazets and the Konus team for the IPN data. F. A. H. acknowledges support from a Presidential Early Career award. S. R. K., S. G. D., and J. P. H. thank NSF for support of their ground-based GRB programs. K. H. is grateful for Ulysses support under JPL contract 958056 and NEAR support under NAG5-9503.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
Subject Keywords:cosmology: observations—galaxies: ISM—gamma rays: bursts
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2001-11
Issue or Number:1
Record Number:CaltechAUTHORS:20150227-151024707
Persistent URL:
Official Citation:Multicolor Observations of the GRB 000926 Afterglow P. A. Price et al. 2001 ApJ 549 L7
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:55348
Deposited By: Deborah Miles
Deposited On:06 Mar 2015 18:51
Last Modified:10 Nov 2021 20:45

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