Journal Article

High-energy emission as a test of the prior emission model for gamma-ray burst afterglows

Kohta Murase, Kenji Toma, Ryo Yamazaki, Shigehiro Nagataki and Kunihito Ioka

in Monthly Notices of the Royal Astronomical Society: Letters

Published on behalf of The Royal Astronomical Society

Volume 402, issue 1, pages L54-L58
Published in print February 2010 |
Published online February 2010 | e-ISSN: 1745-3933 | DOI:

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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.

Keywords: radiation mechanisms: non-thermal; gamma rays: bursts; gamma-rays: theory

Journal Article.  3691 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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