1303.2704 (Z. Lucas Uhm et al.)
Z. Lucas Uhm, Bing Zhang
We show that a fast-cooling synchrotron spectrum has a photon index harder than -1.5, as long as one introduces the evolution of magnetic field in the emission region during the course of emission, an important physical process hitherto ignored in theoretical modeling. By introducing a reasonable decay law of magnetic fields, we model the prompt emission spectrum of GRBs, and found that the low-energy photon index below the injection frequency is typically around -1 in the time scale of seconds, well consistent with the data. The model photon spectrum can be fit with the well-known "Band" function. All these suggest that fast-cooling synchrotron radiation is the dominant mechanism to power GRBs.
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http://arxiv.org/abs/1303.2704
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