The Jet and the Supernova in GRB990712

Abstract

The optical light curve of the afterglow following the gamma-ray burst GRB990712 is re-examined. Recently published polarization measurements of that source require a collimated outflow geometry that in turn predicts a break in the light curve. We show that the V-band light curve is consistent with such a break and that the post-break light curve evolution is dominated by a supernova contribution.

4 pages, 1 figure, accepted for publication in ApJL

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• Supernova Hosts for Gamma-Ray Burst Jets: Dynamical Constraints
• Constraining ${\Omega }_M$ and Dark Energy with Gamma-Ray Bursts
• A Systematic Analysis of Supernova Light in Gamma-Ray Burst Afterglows
• Detection of a supernova signature associated with GRB 011121
• A new method for estimating the bolometric properties of Ibc SNe
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• Discovery of GRB 020405 and its Late Red Bump
• Towards a complete theory of Gamma Ray Bursts
• The Gamma-Ray Burst Hubble Diagram and Its Cosmological Implications
• Can Gamma-Ray Bursts Be Used to Measure Cosmology? A Further Analysis
• GRB 011121: A collimated outflow into wind-blown surroundings
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• The Host Galaxy of GRB 990712
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• Is there a 1998bw-like supernova in the afterglow of gamma ray burst 011121?
• The supernova associated with GRB 020405
• Polarization constraints on the geometry of the magnetic field in the external shock of gamma-ray bursts
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