Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-03-21
Astrophys.J. 608 (2004) L93-L96
Astronomy and Astrophysics
Astrophysics
11 pages, 3 figures, submitted to ApJ Letters
Scientific paper
10.1086/422423
Optical and infrared monitoring of the afterglow site of gamma-ray burst (GRB) 031203 has revealed a brightening source embedded in the host galaxy, which we attribute to the presence of a supernova (SN) related to the GRB ("SN 031203"). We present details of the discovery and evolution of SN 031203 from 0.2 to 92 days after the GRB, derived from SMARTS consortium photometry in I and J bands. A template type Ic lightcurve, constructed from SN 1998bw photometry, is consistent with the peak brightness of SN 031203 although the lightcurves are not identical. Differential astrometry reveals that the SN, and hence the GRB, occurred less than 300 h_71^-1 pc (3-sigma) from the apparent galaxy center. The peak of the supernova is brighter than the optical afterglow suggesting that this source is intermediate between a strong GRB and a supernova.
Bailyn Charles D.
Bloom Josh S.
Buxton Michelle M.
Cobb Bethany E.
van Dokkum Pieter G.
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