Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Intensity Distribution of Faint Gamma-ray Bursts Detected with BATSE   We have recently completed a search of 6 years of archival BATSE data for
gamma-ray bursts (GRBs) that were too faint to activate the real-time burst
detection system running onboard the spacecraft. These "non-triggered" bursts
can be combined with the "triggered" bursts detected onboard to produce a GRB
intensity distribution that reaches peak fluxes a factor of 2 lower than could
be studied previously. The value of the V/Vmax statistic (in Euclidean space)
for the bursts we detect is 0.177 +/- 0.006. This surprisingly low value is
obtained because we detected very few bursts on the 4.096 s and 8.192 s time
scales (where most bursts have their highest signal-to-noise ratio) that were
not already detected on the 1.024 s time scale. If allowance is made for a
power-law distribution of intrinsic peak luminosities, the extended peak flux
distribution is consistent with models in which the redshift distribution of
the gamma-ray burst rate approximately traces the star formation history of the
Universe. We argue that this class of models is preferred over those in which
the burst rate is independent of redshift. We use the peak flux distribution to
derive a limit of 10% (99% confidence) on the fraction of the total burst rate
that could be contributed by a spatially homogeneous (in Euclidean space)
subpopulation of burst sources, such as type Ib/c supernovae. These results
lend support to the conclusions of previous studies predicting that relatively
few faint "classical" GRBs will be found below the BATSE onboard detection
threshold.

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The categories of this paper are: acc-phys
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The categories of this paper are: ao-sci
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The categories of this paper are: nucl-th
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The categories of this paper are: cs
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The categories of this paper are: eess
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-lat
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The categories of this paper are: hep-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: math-ph
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The categories of this paper are: q-fin
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The categories of this paper are: hep-ex
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The categories of this paper are: dg-ga
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The categories of this paper are: nucl-ex