Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Swift X-ray Afterglows and the Missing Jet Break Problem   We present a systematic survey of the temporal and spectral properties of all
GRB X-ray afterglows observed by Swift-XRT between January 2005 and July 2007.
We have constructed a catalog of all light curves and spectra and investigate
the physical origin of each afterglow segment in the framework of the forward
shock models by comparing the data with the closure relations. We search for
possible jet-like breaks in the lightcurves and try to explain some of the
"missing" X-ray jet breaks in the lightcurves.

21
The categories of this paper are: adap-org
7
The categories of this paper are: hep-th
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess
26
The categories of this paper are: bayes-an
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio
4
The categories of this paper are: cond-mat
29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn