Gamma-Ray Burst In Swift Era: Analysis of Afterglow Light Curves
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Date
2017-10
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Addis Ababa University
Abstract
We presented the temporal study of all swift/XRT observations of GRB afterglows
discovered between January 2005 and July 2005 which they have two or more than
two breaks and well known redshift. After constructing and fitting all light curves
using MATLAB programming, we have analyzed the temporal and spectral indices
for each segments in the canonical X-ray afterglow light curves.
The temporal decay index is calculated using log f1−log f2
log t2−log t1
. And the numerical
values, resulted from the manipulation, were mostly consistent to the theoretical
temporal decay index for each GRBs in each segments. And the spectral index is
from closure relation such as = 2 + .
In our work, we have used the data of flux decay and time from the Evans et al
swift/XRT online repository of United Kingdom solar system data center (UKSSDC).
Once we extracted data, we have analyzed the given data to identify the behaviors
of the afterglow light curves. The data, we have used, had positive and negative
error approximation. Then we have analyzed the data and compared the result and
the theoretical value of temporal decay index. Finally the results have been nearly
confirmed to 3 . 1 . 5 in early steep decay, the shallow decay with 0.5 . 2 . 1,
normal decay with 1.0 < 3 < 1.5 and late steep decay 4. > 2.
Description
Keywords
Gamma-Ray Burst In Swift Era, Analysis of Afterglow Light Curves, Methodology, Model