Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Investigating the EGRET-radio galaxies link with INTEGRAL: the case of
  3EG J1621+8203 and NGC 6251   The analysis of an INTEGRAL AO2 observation of the error contours of the
EGRET source 3EG J1621+8203 is presented. The only source found inside the
error contours for energies between 20 and 30 keV at 5 sigma detection
significance is the FR I radio galaxy NGC 6251. This supports the
identification of NGC 6251 with 3EG J1621+8203. The observed flux is higher and
softer than observed in the past, but consistent with a variable blazar-like
spectral energy distribution.

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The categories of this paper are: q-fin
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The categories of this paper are: stat
34
The categories of this paper are: chem-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: eess
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The categories of this paper are: quant-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: adap-org
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The categories of this paper are: ao-sci
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The categories of this paper are: q-bio
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The categories of this paper are: hep-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: gr-qc
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The categories of this paper are: supr-con