Radiation Processes in GRBs. Prompt Emission
Mikhail V. Medvedev
Abstract
A substantial fraction of prompt GRB spectra have soft spectral indexes exceeding the maximum allowed by the synchrotron model alphamax=-2/3. Some spectra also exhibit very sharp break at Ep, inconsistent with the smooth synchrotron spectra. These facts pose a serious problem for the ``optically thin synchrotron'' interpretation of the prompt emission. We review various models suggested in order to resolve this puzzle.
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