Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Proton-synchrotron as the radiation mechanism of the prompt emission of
  GRBs?   We discuss the new surprising observational results that indicate quite
convincingly that the prompt emission of Gamma-Ray Bursts (GRBs) is due to
synchrotron radiation produced by a particle distribution that has a low energy
cut-off. The evidence of this is provided by the low energy part of the
spectrum of the prompt emission, that shows the characteristic F(nu) \propto
nu^(1/3) shape followed by F(nu) \propto nu^(-1/2) up to the peak frequency.
This implies that although the emitting particles are in fast cooling, they do
not cool completely. This poses a severe challenge to the basic ideas about how
and where the emission is produced, because the incomplete cooling requires a
small value of the magnetic field, to limit synchrotron cooling, and a large
emitting region, to limit the self-Compton cooling, even considering
Klein-Nishina scattering effects. Some new and fundamental ingredient is
required for understanding the GRBs prompt emission. We propose
proton-synchrotron as a promising mechanism to solve the incomplete cooling
puzzle.

13
The categories of this paper are: quant-ph
0
The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys
5
The categories of this paper are: gr-qc
2
The categories of this paper are: math
28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin
14
The categories of this paper are: math-ph