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All of the observations performed with the IBIS telescope onboard the INTEGRAL observatory during the first 4.5 years of its in-orbit operation have been analyzed to find X-ray bursts. The time history of the IBIS/ISGRI total count rate in the energy range 15-25 keV revealed several hundreds of bursts with a duration of 5-500 s at high statistical significance level (over the entire period of observations, only one event could be detected by chance with a probability of 20%). In addition to the events associated with cosmic gamma-ray bursts (detected in the field of view or the ones that passed through the IBIS shield), solar flares, activity of the soft gamma repeater SGR 1806-20 and several other sources, we were able to localize 424 type I X-ray bursts and, with three exceptions, to identify them with previously known X-ray bursters. The three exceptions were: a burst from a new burster in a low X-ray intensity state that received the name IGR J173642711/17380-3749, GRB 060428C, and a burst from AXJ1754.2-2754, which let us to identify this source as an X-ray burster. Curiously enough, more than 300 bursts were detected from one X-ray burster, GX 354-0. The statistical distributions of bursts in duration, peak flux, fluence, preburst persistent flux and recurrence time have been analyzed for this source. Some of the bursts observed with the IBIS/ISGRI telescope were also detected by the JEM-X telescope onboard the INTEGRAL observatory in the standard X-ray energy range 3-20 keV.

Bursts detected in hard X-rays by the IBIS telescope onboard the INTEGRAL observatory in 2003-2007