Fireballs and cannonballs confront the afterglow of GRB 991208

Details Fireballs and cannonballs confront the afterglow of GRB 991208 Fireballs and cannonballs confront the afterglow of GRB 991208

2002-11-27

arxiv.org/abs/astro-ph/0211596v1

Phys.Lett. B562 (2003) 161-165

Astronomy and Astrophysics

Astrophysics

Submitted for publicaton in ApJL

Scientific paper

10.1016/S0370-2693(03)00593-8

Galama et al. have recently reported their follow-up measurements of the radio afterglow (AG) of the Gamma Ray Burst (GRB) 991208, up to 293 days after burst, and their reanalysis of the broad-band AG, in the framework of standard fireball models. They advocate a serious revision of their prior analysis and conclusions, based on optical data and on their earlier observations during the first two weeks of the AG. We comment on their work and fill a lacuna: these authors have overlooked the possibility of comparing their new data to the available predictions of the cannonball (CB) model, based --like their incorrect predictions-- on the first round of data. The new data are in good agreement with these CB-model predictions. This is in spite of the fact that, in comparison to the fireball models, the CB model is much simpler, much more predictive, has many fewer parameters, practically no free choices... and it describes well --on a universal basis-- all the measured AGs of GRBs of known redshift.

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