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The Discovery and Broadband Follow-up of the Transient Afterglow of GRB 980703

, , , , , , , , , , , , , , , , and

Published 21 October 1998 • © 1998. The American Astronomical Society. All rights reserved. Printed in U.S.A.
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Author affiliations

1 California Institute of Technology, Palomar Observatory, 105-24, Pasadena, CA 91125

2 National Radio Astronomy Observatory, P.O. Box O, Socorro, NM 87801

3 Columbia University, Columbia Astrophysics Laboratory, 538 West 120th Street, New York, NY 10027

4 Observatories of the Carnegie Institution of Washington, 813 Santa Barbara Street, Pasadena, CA 91101

5 Department of Physics and Astronomy, University of Victoria, P.O. Box 3055, Victoria, BC, V8W 3P6, Canada

6 Herzberg Institute of Astrophysics, National Research Council, 5071 West Saanich Road, Victoria, BC, V8X 4M6, Canada

7 University of Saint Andrews, School of Physics and Astronomy, North Haugh, KY16 9SS Saint Andrews, Scotland

8 Howard Hughes Medical Institute, Department of Biochemistry and Cell Biology, MS-140, Rice University, Houston, TX 77005-1892

9 W. M. Keck Observatory, 65-0120 Mamalahoa Highway, Kamuela,HI 96743

10 Joint Astronomy Centre, 600 A'Ohoku Place, Hilo, HI 96720

11 Istituto di Astrofisica Spaziale, CNR, via Fosso del Cavaliere, RomaI-00133, Italy

12 Istituto Tecnologie e Studio Radiazioni Extraterrestri, CNR, Via Gobetti 101, Bologna I-40129, Italy

Dates

Received 28 August 1998
Accepted 25 September 1998
Published

Citation

J. S. Bloom et al 1998 ApJ 508 L21

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DOI

https://doi.org/10.1086/311731

Keywords

cosmology: observations; galaxies: general; gamma rays: bursts

Journal RSS feed

1538-4357/508/1/L21

Abstract

We report on the discovery of the radio, infrared, and optical transient coincident with an X-ray transient proposed to be the afterglow of GRB 980703. At later times when the transient has faded below detection, we see an underlying galaxy with R=22.6; this galaxy is the brightest host galaxy (by nearly 2 mag) of any cosmological gamma-ray burst (GRB) thus far. In keeping with an established trend, the GRB is not significantly offset from the host galaxy. Interpreting the multiwavelength data in the framework of the popular fireball model requires that the synchrotron cooling break was between the optical and X-ray bands on 1998 July 8.5 UT and that the intrinsic extinction of the transient is AV=0.9. This is somewhat higher than the extinction for the galaxy as a whole, as estimated from spectroscopy.

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