Context. Gamma-ray burst emission in the prompt phase is often interpreted as synchrotron radiation from high-energy electrons accelerated in internal shocks. Fast synchrotron cooling of a power-law distribution of electrons leads to the prediction that the slope below the spectral peak has a photon index α = −3/2 (N(E) ∝ Eα). However, this differs significantly from the observed median value α ≈ −1. This discrepancy has been used to argue against this scenario.
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Daigne et al. (2010) studied this question.
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