Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Astrophysical Stochastic Gravitational Wave Background   The stochastic gravitational wave background produced by supernovas,
magnetars and merger of binaries constituted by a pair of compact objects is
reviewed and updated. The merger of systems composed by two black holes
dominates by far the background signal, whose amplitude in the range 10-100 Hz
is above the sensitivity of the planned Einstein laser interferometer (ET). The
background signal at 25 Hz estimated by the LIGO-VIRGO collaboration, based on
the available merger detection data, is in good agreement with the present
theoretical predictions.

16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
15
The categories of this paper are: nucl-ex
8
The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
1
The categories of this paper are: cs
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics