Evidence for isotropic emission in GRB991216

Details Evidence for isotropic emission in GRB991216 Evidence for isotropic emission in GRB991216

2005-03-11

arxiv.org/abs/astro-ph/0503268v3

Adv.Space Res. 38 (2006) 1291-1294

Astronomy and Astrophysics

Astrophysics

6 pages, 1 figure, to appear on Advances in Space Research (in the Proceedings of the 35th COSPAR scientific assembly). New ve

Scientific paper

10.1016/j.asr.2005.05.088

The issue of the possible presence or absence of jets in GRBs is here re-examined for GRB991216. We compare and contrast our theoretically predicted afterglow luminosity in the 2-10 keV band for spherically symmetric versus jetted emission. At these wavelenghts the jetted emission can be excluded and data analysis confirms spherical symmetry. These theoretical fits are expected to be improved by the forthcoming data of the Swift mission.

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