Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Luminosities and Space Densities of Gamma-Ray Bursts   We use a homogeneous sample of gamma-ray bursts (GRB) extracted from 5.9
years of BATSE DISCLA data (astro-ph/9908190) and a variety of broken power-law
luminosity functions to derive GRB luminosities and space densities. Luminosity
functions that are narrow or exhibit no density evolution produce expected
redshift distributions that are incompatible with the observation of a GRB
redshift of 3.4. For q_o=0.1 and density evolution rising to 10 at z=1, we find
for a variety of slopes of the luminosity function values of the local space
density around 0.18 Gpc^{-3} y^{-1} with a range of only 40%. Characteristic
50--300 keV peak luminosities exhibit a range of a factor of 6 around 6e51
erg/s corresponding to a characteristic total luminosity of 1.2e53 erg in the
10--1000 keV band. For q_o=0.5, densities are higher and luminosities lower,
both by a factor of 2.5. The local emissivity of GRBs is 1.0e52 erg Gpc^{-3}
y^{-1} in the 10--1000 keV band.

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The categories of this paper are: nucl-ex
36
The categories of this paper are: cmp-lg
9
The categories of this paper are: nlin
4
The categories of this paper are: cond-mat
23
The categories of this paper are: solv-int
2
The categories of this paper are: math
29
The categories of this paper are: funct-an
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The categories of this paper are: patt-sol
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The categories of this paper are: nucl-th
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The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-th
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The categories of this paper are: q-alg
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The categories of this paper are: adap-org
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The categories of this paper are: stat