Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observations of the high-frequency-peaked BL Lac object 1ES 1218+304
  with VERITAS   The VERITAS collaboration has observed the high-frequency-peaked BL Lac
object 1ES 1218+304 using an array of several imaging Cherenkov telescopes
located at the Fred Lawrence Whipple Observatory in Southern Arizona. A
gamma-ray signal was detected with high significance for the observations taken
during several months in the 2006-2007 observing season. Here we present the
detection of 1ES 1218+304 in very-high-energy gamma rays.

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The categories of this paper are: chao-dyn
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The categories of this paper are: econ
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The categories of this paper are: q-fin
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The categories of this paper are: math-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: stat
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The categories of this paper are: dg-ga
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The categories of this paper are: solv-int
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The categories of this paper are: atom-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: nucl-th