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

Details The Discovery and Broad-band Follow-up of the Transient Afterglow of GRB 980703 The Discovery and Broad-band Follow-up of the Transient Afterglow of GRB 980703

1998-08-27

arxiv.org/abs/astro-ph/9808319v1

Astrophys.J. 508 (1998) L21-L24

Astronomy and Astrophysics

Astrophysics

5 pages, 3 figures, and 2 tables. Submitted to the Astrophysical Journal Letters on 27 August 1998

Scientific paper

10.1086/311731

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 magnitudes) of any cosmological GRB thus far. In keeping with an established trend, the GRB is not significantly offset from the host galaxy. Interpreting the multi-wavelength data in the framework of the popular fireball model requires that the synchrotron cooling break was between the optical and X-ray bands on 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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