Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: VERITAS Observations of the Arrival Directions of the Highest Energy
  Cosmic Rays   The recent discovery by the Pierre Auger collaboration of anisotropy in the
arrival directions of the highest energy cosmic rays, correlated with the
positions of nearby active galactic nuclei, encourages the search for
counterpart TeV gamma-ray emission. Approximately half of the sky viewed by the
southern hemisphere Pierre Auger experiment is also visible at reasonable
elevations for the northern hemisphere gamma-ray telescope array, VERITAS. We
report on first observations by VERITAS of regions associated with the arrival
directions of ultra-high energy cosmic ray events.

8
The categories of this paper are: hep-ex
2
The categories of this paper are: math
11
The categories of this paper are: hep-lat
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
14
The categories of this paper are: math-ph
4
The categories of this paper are: cond-mat
26
The categories of this paper are: bayes-an
0
The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin
30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio