Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: COSMOLOGICAL GAMMA RAY BURSTS AND THE HIGHEST ENERGY COSMIC RAYS   We discuss a scenario in which the highest energy cosmic rays (CR's) and
cosmological $\gamma$-ray bursts (GRB's) have a common origin. This scenario is
consistent with the observed CR flux above $10^{20}\text{eV}$, provided that
each burst produces similar energies in $\gamma$-rays and in CR's above
$10^{20}\text{eV}$. Protons may be accelerated by Fermi's mechanism to energies
$\sim10^{20}\text{eV}$ in a dissipative, ultra-relativistic wind, with
luminosity and Lorentz factor high enough to produce a GRB. For a homogeneous
GRB distribution, this scenario predicts an isotropic, time-independent CR
flux.

18
The categories of this paper are: econ
29
The categories of this paper are: funct-an
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
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The categories of this paper are: eess
33
The categories of this paper are: plasm-ph