Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observations of the Crab pulsar between 25 GeV and 100 GeV with the
  MAGIC I telescope   We report on the observation of $\gamma$-rays above 25\,GeV from the Crab
pulsar (PSR B0532+21) using the MAGIC I telescope. Two data sets from
observations during the winter period 2007/2008 and 2008/2009 are used. In
order to discuss the spectral shape from 100\,MeV to 100\,GeV, one year of
public {\it Fermi} Large Area Telescope ({\it Fermi}-LAT) data are also
analyzed to complement the MAGIC data. The extrapolation of the exponential
cutoff spectrum determined with the Fermi-LAT data is inconsistent with MAGIC
measurements, which requires a modification of the standard pulsar emission
models. In the energy region between 25 and 100\,GeV, the emission in the P1
phase (from -0.06 to 0.04, location of the main pulse) and the P2 phase (from
0.32 to 0.43, location of the interpulse) can be described by power laws with
spectral indices of $-3.1 \pm 1.0_{stat} \pm 0.3_{syst}$ and $-3.5 \pm
0.5_{stat} \pm 0.3_{syst}$, respectively. Assuming an asymmetric Lorentzian for
the pulse shape, the peak positions of the main pulse and the interpulse are
estimated to be at phases $-0.009 \pm 0.007$ and $0.393 \pm 0.009$, while the
full widths at half maximum are $0.025 \pm 0.008$ and $0.053 \pm 0.015$,
respectively.

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The categories of this paper are: quant-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: q-alg
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The categories of this paper are: cs
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The categories of this paper are: q-fin
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The categories of this paper are: math
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The categories of this paper are: solv-int
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The categories of this paper are: hep-lat
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The categories of this paper are: math-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: acc-phys
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The categories of this paper are: econ
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The categories of this paper are: bayes-an
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The categories of this paper are: eess
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The categories of this paper are: funct-an
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The categories of this paper are: cond-mat