Journal
ASTROPHYSICAL JOURNAL
Volume 552, Issue 2, Pages L121-L124Publisher
UNIV CHICAGO PRESS
DOI: 10.1086/320328
Keywords
gamma rays : bursts
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The optical light curve of the afterglow following the gamma-ray burst GRB 990712 is reexamined. 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 postbreak light-curve evolution is dominated by a supernova contribution.
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