Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Matters of Gravity, The Newsletter of the Division of Gravitational
  Physics of the American Physical Society, Volume 49, June 2017   DGRAV News:
  We hear that ....
  DGRAV student travel grants
  Research Briefs:
  The Discovery of GW170104
  Obituary:
  Remembering Vishu
  Remembering Cecile DeWitt-Morette
  Remembering Larry Shepley
  Remembering Marcus Ansorg
  Conference Reports:
  EGM20

27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
22
The categories of this paper are: chao-dyn
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an