Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Monitoring of bright, nearby Active Galactic Nuclei with the MAGIC
  telescopes   Observations and detections of Active Galactic Nuclei (AGN) by Cherenkov
telescopes are often triggered by information about high flux states in other
wavelength bands. To overcome this bias, the VHE gamma-ray telescope MAGIC has
conducted dedicated monitoring observations of nearby AGN since 2006. Three
well established, TeV-bright blazars were selected to be observed regularly:
Mrk 421, Mrk 501, and 1ES1959+650. The goals of these observations are to
obtain an unbiased distribution of flux states shedding light on the duty cycle
of AGN, to investigate potential spectral changes during periods of different
source activity, and to correlate the results with multiwavelength
observations. Also clues on a potential periodic behavior of the sources might
be drawn from a study of the obtained lightcurves. By testing predictions of
theoretical models, like, e.g., the correlation between the TeV flux level and
the peak frequency predicted in SSC models, monitoring deepens our knowledge
about the acceleration and emission processes in AGN. The status and results of
the MAGIC AGN monitoring program will be presented.

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The categories of this paper are: math
12
The categories of this paper are: nucl-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-bio
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The categories of this paper are: patt-sol
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The categories of this paper are: q-fin
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The categories of this paper are: eess
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The categories of this paper are: hep-lat
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-ex
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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: alg-geom
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The categories of this paper are: quant-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: supr-con