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

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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 significant fraction of viewers have a very small external shock energy along their line of ... continued below

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10 pages

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Eichler, David; Negev, /Ben Gurion U. of; Granot, Jonathan & /KIPAC, Menlo Park October 5, 2005.

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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 significant fraction of viewers have a very small external shock energy along their line of sight and a very high {gamma}-ray to kinetic energy ratio. The early flat phase in the afterglow light curve implies, according to this or other interpretations, a very large {gamma}-ray efficiency, typically {approx}> 90%, which is very difficult to produce by internal shocks.

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10 pages

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  • Report No.: SLAC-PUB-11514
  • Grant Number: AC02-76SF00515
  • DOI: 10.2172/878093 | External Link
  • Office of Scientific & Technical Information Report Number: 878093
  • Archival Resource Key: ark:/67531/metadc875490

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  • October 5, 2005

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  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 2, 2016, 9 p.m.

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Eichler, David; Negev, /Ben Gurion U. of; Granot, Jonathan & /KIPAC, Menlo Park. The Case for Anisotropic Afterglow Efficiency Within Gamma-Ray Burst Jets, report, October 5, 2005; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc875490/: accessed August 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.