Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Next Generation of IceCube Realtime Neutrino Alerts   In 2016, IceCube initiated a system of public real-time alerts that are
typically issued within one minute, following the detection of a neutrino
candidate event that is likely to be of astrophysical origin. The goal of these
alerts is to enable multi-messenger observations that may identify the neutrino
source. Through January 31, 2019, a total of 20 public alerts have been issued,
with many of them receiving follow-up observations across multiple wavelength
bands. One alert in particular, IceCube-170922A, was found to be associated
with a flaring gamma-ray blazar, TXS 0506+056. This was the first >3 sigma
association of a high-energy neutrino with an electromagnetic counterpart. In
2019, the IceCube collaboration is introducing a new set of neutrino candidate
selections that expand the alert program. These new selections provide two
alert channels. A "Gold" channel will issue alerts for neutrino candidates at
least 50% likely to be of astrophysical origin and is expected to deliver
$\sim$10 alerts per year. Additionally a more frequent "Bronze" channel will
provide $\sim$20 alerts per year for neutrino candidates that are between 30%
and 50% likely to be of astrophysical origin. We present the neutrino event
selections used to generate these alerts, the expected alert rates, and a
description of the alert message.

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The categories of this paper are: hep-ph
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The categories of this paper are: cs
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The categories of this paper are: hep-lat
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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: math
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The categories of this paper are: q-fin
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The categories of this paper are: supr-con
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The categories of this paper are: quant-ph
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The categories of this paper are: physics
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The categories of this paper are: q-alg
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The categories of this paper are: bayes-an
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The categories of this paper are: chem-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: gr-qc
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The categories of this paper are: dg-ga