Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cometary Knots and High Energy Photons And Neutrinos From Gamma Ray
  Bursts   The Hubble Space Telescope has recently discovered thousands of gigantic
comet-like objects in a ring around the central star in the nearest planetary
nebula. We suggest that such circumstellar rings exist around most stars.
Collisions of the relativistic debris from gamma ray bursts in dense stellar
regions with such gigantic comet-like objects, which have been stripped off
from the circumstellar rings by gravitational perturbations, produce detectable
fluxes of high energy $\gamma$-rays and neutrinos.

10
The categories of this paper are: q-bio
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph