Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observational Consequences of GRBs as Sources of Ultra High Energy
  Cosmic Rays   Gamma-ray bursts (GRBs) have long been considered as candidates of
ultrahigh-energy cosmic rays (UHECRs). We investigate the signatures of CR
proton acceleration in the GRBs by consistently taking into account their
hadronic and electromagnetic interactions. We discuss the implications of our
findings for high-energy gamma ray observations with the recently launched
Fermi Gamma-ray Space Telescope.

33
The categories of this paper are: plasm-ph
25
The categories of this paper are: patt-sol
14
The categories of this paper are: math-ph
2
The categories of this paper are: math
17
The categories of this paper are: q-fin
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
34
The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga