A calibrated detector of kilohertz-band gravitational radiation has been built which has sufficiently improved sensitivity over Weber's apparatus to allow comparison with his two-detector coincidence results. No events were observed by us at 710 Hz during a recent three-month period of observation. Weber's data at 1661 and 1030 Hz would imply that we should have seen more than 400 events. During these observations, our sensitivity to gravitational bursts was many times that of Weber during 1969-1970. Absolute limiting flux values are given.

• Received 16 April 1973

DOI:https://doi.org/10.1103/PhysRevLett.31.326