SEMINAR       Thursday, 23rd October 2003 - h. 15:00  Auditorium Bruno Touschek     G. Modestino (INFN-LNF)        Search for gravitational wave signals associated with gamma-ray bursts.           Abstract Gamma Ray Bursts (GRBs) likely arise from the collapse of very massive objects or from the coalescence of compact binary systems. In both  cases, also a burst of gravitational waves (GWs) should be emitted. The observation of a large number of GRB events gives the possibility of a systematic analysis of the GW detector data for searching association between the two emissions. Data collected by the resonant cryogenic detectors, EXPLORER and NAUTILUS,  between 1991 and 2001 have been correlated to the GRB events obtained with BATSE and Beppo-Sax. The analysis has been performed under both hypotheses of constant and  variable delay between GW and GRB.