Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Muons enhancements at sea level in association with Swift-BAT and
  MILAGRO triggers   Recently, triggers occurring during high background rate intervals have been
reporter by Swift-BAT Gamma Ray Burst (GRB) detector. Among them, there were
two on January 24, two on January 25, and two on February 13, and 18, all in
2008. These Swift-BAT triggers in most cases are probably noise triggers that
occurred while Swift was entering the South Atlantic Anomaly (SAA). In fact, we
show that they happen during a plentiful precipitation of high energy particles
in the SAA, producing muons in the atmosphere detected by two directional
telescopes at sea level, inside the SAA region (Tupi experiment). They look
like sharp peaks in the muon counting rate. In the same category are two
triggers from MILAGRO ground based detector, on January 25 and 31, 2008
respectively. In addition, the trigger coordinates are close to (and, in two
cases, inside) the field of view of the telescopes. From an additional analysis
in the behavior of the muon counting rate, it is possible to conclude that the
events are produced by precipitation of high energy charged particles in the
SAA region. Thus, due to its localization, the Tupi experiment constitutes a
new sensor of high energy particle precipitation in the SAA, and it can be
useful in the identification of some triggers of Gamma Ray Burst detectors.

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The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
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The categories of this paper are: comp-gas
3
The categories of this paper are: physics
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The categories of this paper are: math-ph
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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: patt-sol
1
The categories of this paper are: cs
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The categories of this paper are: stat
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The categories of this paper are: cmp-lg
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The categories of this paper are: nucl-ex
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The categories of this paper are: ao-sci
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The categories of this paper are: q-alg
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The categories of this paper are: chao-dyn
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The categories of this paper are: math