First search for gravitational wave bursts with a network of detectors

We report the initial results from a search for bursts of gravitational rad iation by a network of five cryogenic resonant detectors during 1997 and 19 98. This is the first significant search with mon than two detectors observ ing simultaneously. No gravitational wave burst was detected. The false ala rm rate was lower than 1 per 10(4) yr when three or more detectors were ope rating simultaneously. The typical threshold was H similar or equal to 4 x 10(-21) Hz(-1) on the Fourier component at similar to 10(3) Hz of the gravi tational wave strain amplitude. New upper Limits for amplitude and rate of gravitational wave bursts have been set.