Twelve hundred non-triggered gamma ray bursts B. Stern, Ya. Tikhomirova, M. Stepanov, D. Kompaneets, A. Berezhnoy and R. Svensson Astron. Astrophys. Suppl. Ser., 138 3 (1999) 413-414 Published online: 15 September 1999 DOI: 10.1051/aas:1999289