Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Time-resolved multiwavelength observations of the blazar VER J0521+211
  from radio to gamma-ray energies   VER J0521+211 (RGB J0521.8+2112) is one of the brightest and most powerful
blazars detected in the TeV gamma-ray regime. It is located at a redshift of
z=0.108 and since its discovery in 2009, VER J0521+211 has exhibited an average
TeV flux exceeding 0.1 times that of the Crab Nebula, corresponding to an
isotropic luminosity of $3\times10^{44}$ erg s$^{-1}$. We present data from a
comprehensive multiwavelength campaign on this object extending between
November 2012 and February 2014, including single-dish radio observations,
optical photometry and polarimetry, UV, X-ray, GeV and TeV gamma-ray data
(VERITAS, MAGIC). Significant flux variability was observed at all wavelengths,
including a long-lasting high state at gamma-ray energies in Fall 2013.
Nightly-resolved spectra at X-ray and TeV energies are be presented, and
emission mechanisms explaining the observed flux and spectral variability are
discussed.

7
The categories of this paper are: hep-th
24
The categories of this paper are: dg-ga
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
3
The categories of this paper are: physics
2
The categories of this paper are: math
26
The categories of this paper are: bayes-an
20
The categories of this paper are: acc-phys
34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ