Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: High energy $\gamma$-ray emission from PSR B1259$-$63 during 2014 and
  2010 periastron passages   PSR B1259$-$63/SS 2883 is a $\gamma$-ray binary system composed of a radio
pulsar in a long (1236.7 days) and elliptical ($e\sim0.87$) orbit around a Be
star. In its 2010 periastron passage, multiwavelength emission from radio to
TeV was observed, and an unexpected GeV flare was detected by the Fermi Large
Area Telescope (LAT). Here we present the results of the LAT monitoring of PSR
B1259$-$63 during its most recent 2014 periastron passage. We confirm that the
GeV flare is recurrent within the orbit. The comparison of the 2014 and 2010
periastron passages shows overall similarities of flare durations, average flux
levels, and spectra. In contrast, the detailed time evolutions of the two
flares present interesting differences. Indeed, the light curves of the two
flares show both a different structure and peak energy flux ($9.6 \pm1.8 \times
10^{-10}$ erg cm$^{-2}$ s$^{-1}$ and $7.1 \pm1.3 \times 10^{-10}$ erg cm$^{-2}$
s$^{-1}$, respectively in 2010 and 2014). While the tail of the 2010 flare the
flux decayed exponentially, in 2014 it persisted at a high level. The
interpretation of these differences as well as of the flare themselves is
subject of debate.

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The categories of this paper are: chem-ph
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The categories of this paper are: stat
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The categories of this paper are: hep-ph
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The categories of this paper are: physics
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The categories of this paper are: adap-org
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The categories of this paper are: cs
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The categories of this paper are: solv-int
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The categories of this paper are: bayes-an
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The categories of this paper are: math-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: gr-qc
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The categories of this paper are: q-fin
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The categories of this paper are: cond-mat
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The categories of this paper are: q-alg
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The categories of this paper are: comp-gas