Abstract
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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Footnotes
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Based on observations made with ESO Telescopes at La Silla (ESO Programme 59.A-000) and Paranal, Chile [ESO Programme 63.O-0567(B)], and on observations with the NASA/ESA Hubble Space Telescope, obtained from the data archive at the Space Telescope Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under contract NAS5-26555.