1111.3378 (Asaf Pe'er)
Asaf Pe'er
Recent Fermi results have focused attention on gamma-ray burst's (GRB) prompt
emission phase, which is rich in phenomenology and poorly understood. The broad
band spectra observed by Fermi does not fit into any of the frameworks of
existing theoretical models. Thus, Fermi results force new thinking of
questions that were thought to be solved. I highlight here the basic open
questions prior to the launch of Fermi, key Fermi results, and new theoretical
ideas that emerged following these results. These include: (I) renewed interest
in magnetized outflows as a way to understand the dynamics and composition;
(II) interest in photospheric emission, in particular ways to broaden "Planck"
spectrum to resemble the observed "Band" spectrum; (III) The puzzling origin of
the high energy (LAT) photons, first observed in short GRBs; and (IV) new
methods to estimate the Lorentz factor of the outflow.
View original:
http://arxiv.org/abs/1111.3378
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