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Paper: External Shock Model for the Prompt Phase of Gamma Ray Burtsts: Implications for GRB Source Models
Volume: 312, Third Rome Workshop on Gamma-Ray Bursts in the Afterglow Era
Page: 301
Authors: Dermer, C.D.; Mitman, K.E.
Abstract: An external shock model for the prompt gamma-ray luminous phase of gamma-ray bursts (GRBs) is treated both analytically and numerically. A widely cited derivations claiming that an external shock model for rapidly variable GRBs much be very inefficient employs an incorrect expression for the angular timescale. Numerical results show that variable GRBs can be formed with >10% efficiency to transform the directed kinetic energy of the relativistic fireball to gamma-rays. Successes of the external shock model and difficulties with an internal wind/colliding shell model are summarized. An impulsive external shock model is consistent with the supranova model.
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