GRB 011121: A collimated outflow into wind-blown surroundings
Abstract
We discover a break in the GRB 011121 afterglow light curve after 1.3 days, which implies an initial jet opening angle of about 9 deg. The SED during the first four days is achromatic, and supports the jet origin of this break. The SED during the supernova bump can be best represented by a black body with a temperature of 6000 K. The deduced parameters for the decay slope as well as the spectral index favor a wind scenario, i.e. an outflow into a circum-burst environment shaped by the stellar wind of a massive GRB progenitor. Due to its low redshift of z=0.36, GRB 011121 has been the best example for the GRB-supernova connection until GRB 030329, and provides compelling evidence for a circum-burster wind region expected to exist if the progenitor was a massive star.
Cite
@article{arxiv.astro-ph/0309733,
title = {GRB 011121: A collimated outflow into wind-blown surroundings},
author = {J. Greiner and S. Klose and M. Salvato and A. Zeh and R. Schwarz and D. H. Hartmann and N. Masetti and B. Stecklum and G. Lamer and N. Lodieu and R. D. Scholz and C. Sterken and J. Gorosabel and I. Burud and J. Rhoads and I. Mitrofanov and M. Litvak and A. Sanin and V. Grinkov and M. I. Andersen and J. M. Castro Cerón and A. J. Castro-Tirado and A. Fruchter and J. U. Fynbo and J. Hjorth and L. Kaper and C. Kouveliotou and E. Palazzi and E. Pian and E. Rol and N. R. Tanvir and P. M. Vreeswijk and R. A. M. J. Wijers and E. van den Heuvel},
journal= {arXiv preprint arXiv:astro-ph/0309733},
year = {2008}
}
Comments
22 pages ApJ style, accepted for publication