First Light on GRBs with Fermi

Details First Light on GRBs with Fermi First Light on GRBs with Fermi

2010-08-04

arxiv.org/abs/1008.0854v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

9 pages, 2 figures, in Deciphering the Ancient Universe with GRBs, Kyoto, Japan, April 19-23, 2010

Scientific paper

Fermi LAT (Large Area Telescope) and GBM (Gamma ray Burst Monitor) observations of GRBs are briefly reviewed, keeping in mind EGRET expectations. Using gamma\gamma constraints on outflow Lorentz factors, leptonic models are pitted against hadronic models, and found to be energetically favored. Interpretation of the Fermi data on GRBs helps establish whether GRBs accelerate cosmic rays, including those reaching $\approx 10^{20}$ eV.

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