Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Highlights of Recent Multiwavelength Observations of VHE Blazars with
  VERITAS   We present long-term observations of several VHE (E > 100 GeV) blazars with
VERITAS, together with contemporaneous Swift and RXTE X-ray data. The observed
targets include Mrk 421, Mrk 501, 1ES 2344+514. Strong flux and spectral
variability is seen in Mrk 421 on nightly time-scales between January and June
2008, revealing a highly correlated X-ray to GeV/TeV connection. Modest X-ray
variability is evident in Mrk 501. Observations of 1ES 2344+514 in December
2007 show VHE gamma-ray and X-ray flux doubling on nightly time-scales.

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The categories of this paper are: ao-sci
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The categories of this paper are: solv-int
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The categories of this paper are: alg-geom
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The categories of this paper are: econ
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The categories of this paper are: chem-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-ex
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The categories of this paper are: acc-phys
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The categories of this paper are: mtrl-th
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The categories of this paper are: quant-ph
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The categories of this paper are: nlin
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-fin
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The categories of this paper are: stat
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The categories of this paper are: supr-con
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The categories of this paper are: gr-qc