Granot 2009 一些Fermi高能的观测特征和080916C

主要内容:
写了一点大家正在关心一些关于高能的哪些热点问题: 可能的辐射机制有哪些, 延迟的辐射机制, 对罗仑兹因子的限制.

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Title:		GRB Theory in the Fermi Era
Authors:		Granot, Jonathan; Fermi LAT, for the; GBM collaborations
Publication:		eprint arXiv:0905.2206
Publication Date:		05/2009
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena
Comment:		8 pages, 1 figure with 3 panels - Invited talk, submitted to Proceedings of 44th Recontres de Moriond - "Very High Energy Phenomena in the Universe", La Thuile (Val d'Aosta, Italy) February 1 - 8, 2009
Bibliographic Code:		2009arXiv0905.2206G

Abstract

Before the launch of the Fermi Gamma-ray Space Telescope there were only a handful of gamma-ray bursts (GRBs) detected at high energies (above 100 MeV), while several different suggestions have been made for possible high-energy emission sites and mechanisms. Here I briefly review some of the theoretical expectations for high-energy emission from GRBs, outline some of the hopes for improving our understanding of GRB physics through Fermi observations of the prompt GRB emission or the early afterglow (first few hours after the GRB), and summarize what we have learned so far from the existing Fermi GRB observations (over its first half-year of operation). Highlights include the first detection of > GeV emission from a short GRB, as well as detailed temporal and spectral information for the first GRB with > GeV emission and a measured redshift, that has the highest measured apparent (isotropic equivalent) radiated energy output (for any GRB), the largest lower limit on the bulk Lorentz factor of the emitting region, and constrains possible Lorentz invariance violation by placing a robust lower limit on the quantum gravity mass.

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