Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Correlation between the isotropic energy and the peak energy at zero
  fluence for the individual pulses of GRBs: towards an universal physical
  correlation for the prompt emission   We find a strong correlation between the peak energy at zero fluence ($\rm
E_{peak,0}$) and the isotropic energy ($\rm E_{\gamma,iso}$) of the 22 pulses
of 9 Gamma Ray Bursts (GRB) detected by the Fermi satellite. The correlation
holds for the individual pulses of each GRB, which shows the reality of the
correlation. The derived correlation (Spearman correlation coefficient, $r$, is
0.96) is much stronger compared to the correlations using $\rm E_{peak}$ (in
place of $\rm E_{peak,0}$) determined from the time-integrated spectrum ($r$ =
0.8), or the time-resolved spectrum not accounting for broad pulse structures
($r$ = 0.37), or the pulse-wise spectrum ($r$ = 0.89). Though the improvement
in the $\rm E_{peak}$ - $\rm E_{\gamma,iso}$ relation (the Amati relation) for
a pulse-wise analysis is known earlier, this is the first time a parameter
derived from a joint spectral and timing fit to the data is shown to improve
the correlation. We suggest that $\rm E_{peak,0}$, rather than $\rm E_{peak}$,
is intrinsic to a GRB pulse and a natural choice as the parameter in the
pulse-wise correlation studies.

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The categories of this paper are: cond-mat
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The categories of this paper are: nlin
21
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: hep-th
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
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The categories of this paper are: econ
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-lat
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The categories of this paper are: math
25
The categories of this paper are: patt-sol
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The categories of this paper are: funct-an
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The categories of this paper are: stat
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The categories of this paper are: gr-qc
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The categories of this paper are: bayes-an