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The Case for Anisotropic Afterglow Efficiency Within Gamma-Ray Burst Jets

Description: Early X-ray afterglows recently detected by Swift frequently show a phase of very shallow flux decay lasting from a few hundred seconds up to {approx} 10{sup 4} s, followed by a steeper, more familiar decay. We suggest that the flat early part of the light curve may be a combination of the decaying tail of the prompt emission and the delayed onset of the afterglow emission observed from viewing angles slightly outside the edge of the jet, as predicted previously. This would imply that a signifi… more
Date: October 5, 2005
Creator: Eichler, David; Negev, /Ben Gurion U. of; Granot, Jonathan & /KIPAC, Menlo Park
Partner: UNT Libraries Government Documents Department
open access

Implications of the Early X-Ray Afterglow Light Curves of Swift GRBs

Description: According to current models, gamma-ray bursts (GRBs) are produced when the energy carried by a relativistic outflow is dissipated and converted into radiation. The efficiency of this process, {epsilon}{sub {gamma}}, is one of the critical factors in any GRB model. The X-ray afterglow light curves of Swift GRBs show an early stage of flattish decay. This has been interpreted as reflecting energy injection. When combined with previous estimates, which have concluded that the kinetic energy of the… more
Date: January 17, 2006
Creator: Granot, Jonathan; /KIPAC, Menlo Park; Konigl, Arieh; /Chicago U., Astron. Astrophys. Ctr. /Chicago U., EFI; Piran, Tsvi & U., /Hebrew
Partner: UNT Libraries Government Documents Department
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