Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Setting upper limits on the strength of periodic gravitational waves
  using the first science data from the GEO600 and LIGO detectors   Data collected by the GEO600 and LIGO interferometric gravitational wave
detectors during their first observational science run were searched for
continuous gravitational waves from the pulsar J1939+2134 at twice its rotation
frequency. Two independent analysis methods were used and are demonstrated in
this paper: a frequency domain method and a time domain method. Both achieve
consistent null results, placing new upper limits on the strength of the
pulsar's gravitational wave emission. A model emission mechanism is used to
interpret the limits as a constraint on the pulsar's equatorial ellipticity.

21
The categories of this paper are: adap-org
19
The categories of this paper are: eess
34
The categories of this paper are: chem-ph
7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol
6
The categories of this paper are: astro-ph
17
The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph
4
The categories of this paper are: cond-mat
26
The categories of this paper are: bayes-an
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga