Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Search for Very High Energy Gamma Rays from an X-ray Selected Blazar
  Sample   In recent years, blazar surveys at radio and X-ray energies have greatly
increased our understanding of this type of active galaxy. The combination of
multi-wavelength data has shown that blazars follow a well defined sequence in
terms of their broad band spectral properties. Together with increasingly
detailed emission models, this information has provided not only tools with
which to identify potential sources of TeV emission but also predictions of
their gamma-ray flux. A list of such candidates has been used in this work to
investigate the best targets for TeV observations. Observations reported here
have resulted in upper limits which do not conflict with the latest model
predictions.

31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
4
The categories of this paper are: cond-mat
3
The categories of this paper are: physics
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th