Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Matters of Gravity, the newsletter of the APS Topical Group on
  Gravitation, Spring 2002   Community News:
  - Center for Gravitational Wave Physics, by Sam Finn
  - Perimeter Institute for Theoretical Physics, by Lee Smolin
  Research Briefs:
  - Detector and Data Developments within GEO 600, by Alicia Sintes
  - The Virtual Data Grid and LIGO, by Pat Brady and Manuela Campanelli
  - 1000 hours of data and first lock of the recycled TAMA300, by Seiji
Kawamura
  - LIGO Takes Some Data!, by Stan Whitcomb
  - Quantum gravity: progress from an unexpected direction, by Matt Visser
  Conference report:
  - Gravitational-wave phenomenology at PennState, by Nils Andersson

33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
2
The categories of this paper are: math
18
The categories of this paper are: econ
21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph
17
The categories of this paper are: q-fin
24
The categories of this paper are: dg-ga
29
The categories of this paper are: funct-an
27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex