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arxiv: astro-ph/0410490 · v1 · submitted 2004-10-20 · 🌌 astro-ph

Radiation Processes in GRBs. Prompt Emission

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keywords promptspectrasynchrotronemissionallowedalphabreakexceeding
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A substantial fraction of prompt GRB spectra have soft spectral indexes exceeding the maximum allowed by the synchrotron model alpha_{max}=-2/3. Some spectra also exhibit very sharp break at E_p, 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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