ON GRB PHYSICS REVEALED BY FERMI/LAT

作     者：ZHUO LI 

作者机构：Department of Astronomy/Kavli Institute for Astronomy and Astrophysics Peking University Beijing 100871 China Key Laboratory for the Structure and Evolution of Celestial Objects Chinese Academy of Sciences Kunming 650011 China 

出 版 物：《International Journal of Modern Physics: Conference Series》 

年 卷 期：2013年第ijmpcs卷第23期

页      面：223-227页

学科分类：07[理学] 0702[理学-物理学] 

主　　题：Gamma-ray burst high energy Fermi/LAT 

摘      要：We discuss the implications of Fermi/LAT observations on several aspects of gamma-ray burst (GRB) physics, including the radiation process, the emission sites, the bulk Lorentz factor, and the pre-shock magnetic field: (1) MeV-range emission favors synchrotron process but the highest energy ( 10 GeV) emission may not be synchrotron origin, more likely inverse Compton origin; (2) GRB should have multi-zone emission region, with MeV emission produced at smaller radii while optical and 100 MeV emission at larger radii; (3) the bulk Lorentz factor can be a few 100 s, much lower than 10 3 , in multi-zone model; (4) the upstream magnetic field of afterglow shock is strongly amplified to be at least in mG scale.