The Jet and the Supernova in GRB 990712
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. 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.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- May 2001
- DOI:
- 10.1086/320328
- arXiv:
- arXiv:astro-ph/0104174
- Bibcode:
- 2001ApJ...552L.121B
- Keywords:
-
- Gamma Rays: Bursts;
- Astrophysics
- E-Print:
- 4 pages, 1 figure, accepted for publication in ApJL