Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Search for astrophysical PeV gamma rays from point sources with Carpet-2   Early results of the search for E_\gamma>1 PeV cosmic photons from point
sources with the data of Carpet-2, an air-shower array equipped with a 175 m^2
muon detector, are presented. They include 95% CL upper limits on PeV photon
fluxes from stacked directions of high-energy IceCube neutrino events and from
four predefined sources, Crab, Cyg X-3, Mrk 421 and Mrk 501. An insignificant
excess of events from Mrk 421 will be further monitored. Prospects of the use
of the upgraded installation, Carpet-3 (410 m^2 muon detector), scheduled to
start data taking in 2019, for searches of E_\gamma>100 TeV photons, are
briefly discussed.

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The categories of this paper are: solv-int
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The categories of this paper are: econ
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The categories of this paper are: dg-ga
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The categories of this paper are: math
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The categories of this paper are: funct-an
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The categories of this paper are: q-alg
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The categories of this paper are: gr-qc
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The categories of this paper are: cond-mat
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The categories of this paper are: adap-org
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The categories of this paper are: nucl-th
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The categories of this paper are: acc-phys
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The categories of this paper are: q-fin
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The categories of this paper are: nucl-ex
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The categories of this paper are: atom-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: alg-geom