Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Beaming effects in GRBs and orphan afterglows   The overall dynamical evolution and radiation mechanism of $\gamma$-ray burst
jets are briefly introduced. Various interesting topics concerning beaming in
$\gamma$-ray bursts are discussed, including jet structures, orphan afterglows
and cylindrical jets. The possible connection between $\gamma$-ray bursts and
neutron star kicks is also addressed.

23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
21
The categories of this paper are: adap-org
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess
26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg