Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evidence for Circumburst Extinction of Gamma-Ray Bursts with Dark
  Optical Afterglows and Evidence for a Molecular Cloud Origin of Gamma-Ray
  Bursts
27
The categories of this paper are: comp-gas
19
The categories of this paper are: eess
21
The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
23
The categories of this paper are: solv-int
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
5
The categories of this paper are: gr-qc
3
The categories of this paper are: physics
25
The categories of this paper are: patt-sol
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th