Gamma-ray burst beaming: a universal configuration with a standard energy reservoir?

Details Gamma-ray burst beaming: a universal configuration with a standard energy reservoir? Gamma-ray burst beaming: a universal configuration with a standard energy reservoir?

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...199.1201z&link_type=abstract

American Astronomical Society, 199th AAS Meeting, #12.01; Bulletin of the American Astronomical Society, Vol. 33, p.1326

Astronomy and Astrophysics

Astronomy

Scientific paper

We consider a gamma-ray burst (GRB) anisotropic fireball with the energy per solid angle decreasing with the opening angle with an index of k, allowing the observer's viewing direction to be at an arbitrary angle with respect to the jet axis. This model can reproduce the key features predicted in the conventional on-axis uniform jet models, with the novelty that the achromatic breaking time in the broadband afterglow lightcurves corresponds to the epoch when the relativistic beaming angle is equal to the viewing angle, rather than to the jet half opening angle. If all the GRB fireballs have such a similar energy distribution form with 1.5 < k < 2, GRBs may have a quasi-universal beaming configuration, aside from a standard energy reservoir.

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