Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: VHE Gamma-Ray Observation of the Crab Nebula and its Pulsar with the
  MAGIC telescope   We report about very high energy (VHE) gamma-ray observations of the Crab
Nebula with the MAGIC telescope. The gamma-ray flux from the nebula was
measured between 60 GeV and 9 TeV. The energy spectrum can be described with a
curved power law dF/dE=f0 (E/300 GeV)^(a+b*log10(E/300 GeV)) with a flux
normalization f0 of(6.0+-0.2)*10^-10 1/(cm^2 s TeV), a=-2.31+-0.06 and
b=-0.26+-0.07. The position of the IC-peak is determined at (77+-47) GeV.
Within the observation time and the experimental resolution of the telescope,
the gamma-ray emission is steady and pointlike. The emission's center of
gravity coincides with the position of the pulsar. Pulsed gamma-ray emission
from the pulsar could not be detected. We constrain the cutoff energy of the
spectrum to be less than 27 GeV, assuming that the differential energy spectrum
has an exponential cutoff. For a super-exponential shape, the cutoff energy can
be as high as 60 GeV.

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The categories of this paper are: gr-qc
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: stat
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The categories of this paper are: funct-an
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The categories of this paper are: cs
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The categories of this paper are: q-alg
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The categories of this paper are: cond-mat
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The categories of this paper are: mtrl-th
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The categories of this paper are: ao-sci
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The categories of this paper are: econ
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The categories of this paper are: supr-con
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The categories of this paper are: patt-sol
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The categories of this paper are: nucl-th
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The categories of this paper are: chem-ph