Kinematic arguments against single relativistic shell models for GRBs

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Two main types of models have been suggested to explain the long durations and multiple peaks of Gamma Ray Bursts (GRBs). In one, there is a very quick release of energy at a central site resulting in a single relativistic shell that produces peaks in the time history through its interactions with the ambient material. In the other, the central site sporadically releases energy over hundreds of seconds forming a peak with each burst of energy. The authors show that the average envelope of emission and the presence of gaps in GRBs are inconsistent with a single relativistic shell. They ... continued below

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8 p.

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Fenimore, E.E.; Ramirez, E. & Sumner, M.C. September 1, 1997.

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Two main types of models have been suggested to explain the long durations and multiple peaks of Gamma Ray Bursts (GRBs). In one, there is a very quick release of energy at a central site resulting in a single relativistic shell that produces peaks in the time history through its interactions with the ambient material. In the other, the central site sporadically releases energy over hundreds of seconds forming a peak with each burst of energy. The authors show that the average envelope of emission and the presence of gaps in GRBs are inconsistent with a single relativistic shell. They estimate that the maximum fraction of a single shell that can produce gamma-rays in a GRB with multiple peaks is 10{sup {minus}3}, implying that single relativistic shells require 10{sup 3} times more energy than previously thought. They conclude that either the central site of a GRB must produce {approx}10{sup 51} erg/s{sup {minus}1} for hundreds of seconds, or the relativistic shell must have structure on a scales the order of {radical}{epsilon}{Gamma}{sup {minus}1}, where {Gamma} is the bulk Lorentz factor ({approximately}10{sup 2} to 10{sup 3}) and {epsilon} is the efficiency.

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8 p.

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OSTI as DE98004253

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  • 4. Huntsville gamma ray bursts symposium, Huntsville, AL (United States), 15-20 Sep 1997

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  • Other: DE98004253
  • Report No.: LA-UR--97-5162
  • Report No.: CONF-9709153--
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 658343
  • Archival Resource Key: ark:/67531/metadc712032

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  • September 1, 1997

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  • Sept. 12, 2015, 6:31 a.m.

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  • Aug. 8, 2016, 8:34 p.m.

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Fenimore, E.E.; Ramirez, E. & Sumner, M.C. Kinematic arguments against single relativistic shell models for GRBs, article, September 1, 1997; New Mexico. (digital.library.unt.edu/ark:/67531/metadc712032/: accessed June 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.