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arXiv · astro-ph/9808319

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

J. S. Bloom·D. A. Frail·S. R. Kulkarni·S. G. Djorgovski·J. P. Halpern·R. O. Marzke·D. R. Patton·J. B. Oke·K. D. Horne·R. Gomer·R. Goodrich·R. Campbell·G. H. Moriarty-Schieven·R. O. Redman·P. A. Feldman·E. Costa·N. Masetti
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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 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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J. S. Bloom, D. A. Frail, S. R. Kulkarni, S. G. Djorgovski, J. P. Halpern, R. O. Marzke, D. R. Patton, J. B. Oke, K. D. Horne, R. Gomer, R. Goodrich, R. Campbell, G. H. Moriarty-Schieven, R. O. Redman, P. A. Feldman, E. Costa, N. Masetti. 1998-08-27. The Discovery and Broad-band Follow-up of the Transient Afterglow of GRB 980703. https://doi.org/10.1086/311731

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