Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Characteristics of Two-episode Emission Patterns in {\em Fermi} Long
  Gamma-Ray Bursts   Two-episode emission components separated by quiescent gaps in the prompt
emission of gamma-ray bursts (GRBs) have been observed in the {\em Swift} era,
but there is a lack of spectral information due to the narrow energy band of
the {\em Swift}/Burst Alert Telescope. In this paper, a systematic analysis of
the spectral and temporal properties of the prompt emission of 101 {\em
Fermi}/Gamma-ray Burst Monitor detected long GRBs show the existence of
two-episode emission components in the light curves, with quiescent times of up
to hundreds of seconds. We focus on investigating the differences of those two
emission episodes. We find that the light curves of the two emission components
exhibit different behavior, e.g., a soft emission component that either
precedes or follows the main prompt emission or that the intensity of the two
emission episodes are comparable with each other. No statistically significant
correlation in the duration of the two emission episodes can be claimed. We
define a new parameter $\varepsilon$ as the ratio of the peak flux of the first
and second emission episodes and find that a higher $\varepsilon$ corresponds
to a larger fluence. The preferred spectral model in our analysis is a cutoff
power-law model for most GRBs. The distribution of $E_p$ for episodes I and II
range from tens of keV to 1000 keV with a lognormal fit and there are no
significant differences between them. Moreover, we do not find significant
relationships between $\varepsilon$ and $E_p$ for the two emission episodes.
Those results suggest that these two-episode emission components likely share
the same physical origin.

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The categories of this paper are: physics
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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: nucl-th
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The categories of this paper are: comp-gas
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The categories of this paper are: plasm-ph
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The categories of this paper are: q-bio
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The categories of this paper are: econ
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The categories of this paper are: stat
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The categories of this paper are: alg-geom
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The categories of this paper are: bayes-an
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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: math
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The categories of this paper are: mtrl-th
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The categories of this paper are: dg-ga