Can the Jet steepen the light curves of GRB afterglows ?

Received ; accepted – 2 – ABSTRACT Beaming of relativistic ejecta in GRBs has been postulated by many authors in order to reduce the total GRB energy, thus it is very important to look for the observational evidence of beaming. Rhoads (1999) has pointed out that the dynamics of the blast wave, which is formed when the beamed ejecta sweeping the external… (More)