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Astron. Astrophys. Suppl. Ser. 138, 413-414

Twelve hundred non-triggered gamma ray bursts

B. Stern1,4 - Ya. Tikhomirova2 - M. Stepanov3 - D. Kompaneets2 - A. Berezhnoy3 - R. Svensson4

1 - Institute for Nuclear Research, Russian Academy of Sciences, Moscow 117312, Russia
2 - Astro Space Center of Lebedev Physical Institute, Moscow, Profsoyuznaya 84/32, 117810, Russia
3 - Skobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow 119899, Russia
4 - Stockholm Observatory, S-133 36 Saltsjöbaden, Sweden

Received January 21; accepted June 25, 1999


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 $\rm \sim 0.1\, ph\, cm^{-2}\, s^{-1}$. 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.

Key words: gamma-ray bursts -- methods: data analysis

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