An off-line scan for nontriggered gamma-ray bursts (GRBs) in the BATSE daily records at 1024 ms time resolution covering about 7 yr of observations gave 1353 nontriggered and 1581 triggered GRBs. The scan efficiency was measured by adding artificial test bursts to the data. The distribution could be extended log N-log P down to peak fluxes, photons cm Ϫ2 s Ϫ1 . Previous indications of a turnover at small P are not confirmed. P ∼ 0.1 The distribution cannot be fitted with a standard candle model with a nonevolving GRB source log N-log P population, assuming that there are no large non-GRB contaminations. It is likely that the intrinsic luminosity function of GRBs is wide.
Abstract. We present preliminary results of an off-line search for non-triggered gamma-ray bursts (GRBs) in the BATSE daily records for about 5.7 years of observations. We found more GRB-like events than the yield of the similar search of Kommers et al. (1998) and extended the log N − log P distribution down to ∼ 0.1 ph cm −2 s −1 . The indication of a turnover of the log N − log P at a small P is not confirmed: the distribution is straight at 1.5 decades with the power law index −.6 and cannot be fitted with a standard candle cosmological model.
We present preliminary results of an off-line search for non-triggered gamma-ray bursts (GRBs) in the BATSE daily records for about 5.7 years of observations. We found more GRB-like events than the yield of the similar search of Kommers et al. (1998) and extended the Log N -log P distribution down to ∼ 0.1 ph cm −2 s −1 . The indication of a turnover of the log N -log P at a small P is not confirmed: the distribution is straight at 1.5 decades with the power law index -.6 and cannot be fitted with a standard candle cosmological model.
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