Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Correlated Spectral And Temporal Behaviour Of Late-Time Afterglows Of
  Gamma Ray Bursts   The cannonball (CB) model of gamma ray bursts (GRBs) predicts that the
asymptotic behaviour of the spectral energy density of the X-ray afterglow of
GRBs is a power-law in time and in frequency where the difference between the
temporal and spectral power-law indexes, $\alpha_X-\beta_X$, is restricted to
the values 0, 1/2 and 1. Here we report the distributions of the values
$\alpha_X$, $\beta_X$ and their difference for a sample of 315 Swift GRBs. This
sample includes all Swift GRBs that were detected before August 1, 2012, whose
X-ray afterglow extended well beyond 1 day and the estimated error in
$\alpha_X-\beta_X$ was $\leq 0.25$. The values of $\alpha_X$ were extracted
from the CB model fits to the entire light curves of their X-ray afterglow
while the spectral index was extracted by the Swift team from the time
integrated X-ray afterglow of these GRBs. We found that the distribution of the
difference $\alpha_X-\beta_X$ for these 315 Swift GRBs has three narrow peaks
around 0, 1/2 and 1 whose widths are consistent with being due to the
measurement errors, in agreement with the CB model prediction.

14
The categories of this paper are: math-ph
26
The categories of this paper are: bayes-an
13
The categories of this paper are: quant-ph
24
The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th
21
The categories of this paper are: adap-org
27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg
3
The categories of this paper are: physics
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
4
The categories of this paper are: cond-mat