MG15 - Talk detail

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Abstract

This talk will outline how Fermi observations of GeV emission from GRBs have greatly contributed to our knowledge of GRB physics as well as in other areas. Fermi observations of the prompt GRB emission have shed light on its spectral and temporal properties (delayed and long-lived high-energy emission, distinct high-energy hard power-law spectral component, a possible quasi-thermal component), which bear on its emission mechanism. They have also provided valuable information on the outflow composition as well as on the Lorentz factor, location, and geometry of the emission region. Fermi high-energy afterglow observations, have probed the physics of relativistic collisionless shocks, and require changes to the standard picture. Fermi GRB observations have also helped study fundamental physics, and in particular Lorentz Invariance Violation, as well as the Extra-galactic Background Light. Finally, some synergies with other instruments will be mentioned, along with a brief outlook for the future.

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