Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Search for high energy $\gamma$-rays from the direction of the candidate
  electromagnetic counterpart to the binary black hole merger
  gravitational-wave event S190521g   The gravitational-wave event S190521g -- a likely binary black hole merger in
the accretion disk of an active galactic nucleus -- was accompanied by an
optical counterpart. Such dense environments around luminous energy release
regions are favourable for high energy $\gamma$-ray production. We report on a
search for high energy $\gamma$-rays from the direction of the candidate
electromagnetic counterpart to the S190521g event using publicly-available data
of the Fermi-LAT space $\gamma$-ray telescope. No significant signal was found.
We present upper limits on the spectral energy distribution of the source in
the 100 MeV - 300 GeV energy range. We discuss the importance of studying
S190521g-like transients in the context of cosmic ray acceleration,
$\gamma$-ray and neutrino production in such sources.

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The categories of this paper are: gr-qc
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The categories of this paper are: math-ph
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The categories of this paper are: econ
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The categories of this paper are: hep-th
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The categories of this paper are: cond-mat
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
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The categories of this paper are: q-fin
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The categories of this paper are: chao-dyn
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The categories of this paper are: nucl-th
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The categories of this paper are: atom-ph
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The categories of this paper are: funct-an
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The categories of this paper are: patt-sol
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The categories of this paper are: physics
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The categories of this paper are: stat
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The categories of this paper are: bayes-an