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The network of resonant bar detectors of gravitational waves resumedcoordinated observations within the International Gravitational EventCollaboration (IGEC-2). Four detectors are taking part in this collaboration:ALLEGRO, AURIGA, EXPLORER and NAUTILUS. We present here the results of thesearch for gravitational wave bursts over 6 months during 2005, when IGEC-2 wasthe only gravitational wave observatory in operation. The network data analysisimplemented is based on a time coincidence search among AURIGA, EXPLORER andNAUTILUS, keeping the data from ALLEGRO for follow-up studies. With respect tothe previous IGEC 1997-2000 observations, the amplitude sensitivity of thedetectors to bursts improved by a factor about 3 and the sensitivity bandwidthsare wider, so that the data analysis was tuned considering a larger class ofdetectable waveforms. Thanks to the higher duty cycles of the single detectors,we decided to focus the analysis on three-fold observation, so to ensure theidentification of any single candidate of gravitational waves (gw) with highstatistical confidence. The achieved false detection rate is as low as 1 percentury. No candidates were found.

Results of the IGEC-2 search for gravitational wave bursts during 2005