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Title:
High-energy emission as a test of the prior emission model for gamma-ray burst afterglows
Authors:
Murase, Kohta; Toma, Kenji; Yamazaki, Ryo; Nagataki, Shigehiro; Ioka, Kunihito
Affiliation:
AA(Yukawa Institute for Theoretical Physics, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan), AB(Department of Astronomy & Astrophysics; Center for Particle Astrophysics, Pennsylvania State University, University Park, PA 16802, USA), AC(Department of Physical Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan), AD(Yukawa Institute for Theoretical Physics, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan), AE(Theory Division, KEK (High Energy Accelerator Research Organization), Tsukuba 305-0801, Japan)
Publication:
Monthly Notices of the Royal Astronomical Society: Letters, Volume 402, Issue 1, pp. L54-L58. (MNRAS Homepage)
Publication Date:
02/2010
Origin:
MNRAS
MNRAS Keywords:
radiation mechanisms: non-thermal, gamma rays: bursts, gamma-rays: theory
Abstract Copyright:
(c) Journal compilation © 2010 RAS
DOI:
10.1111/j.1745-3933.2009.00799.x
Bibliographic Code:
2010MNRAS.402L..54M

Abstract

ABSTRACT We study high-energy gamma-ray afterglow emission from gamma-ray bursts (GRBs) in the prior emission model, which is proposed to explain the plateau phase of the X-ray afterglow. This model predicts the high-energy gamma-ray emission when the prompt GRB photons from the main flow are up-scattered by relativistic electrons accelerated at the external shock due to the prior flow. The expected spectrum has the peak of ~10-100 GeV at around the end time of the plateau phase for typical GRBs, and high-energy gamma-rays from nearby and/or energetic GRBs can be detected by the current and future Cherenkov telescopes such as MAGIC, VERITAS, CTA and possibly Fermi. Multiwavelength observations by ground-based optical telescopes as well as Fermi and/or Swift satellites are important to constrain the model. Such external inverse-Compton emission may even lead to GeV-TeV gamma-ray signals with the delay time of ~10-100 s, only if the plateau phase is short lived.
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