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Gravitational Wave Detectors And Experiments, Gravitational Radiation Detectors, Mass Spectrometers, And Other Instrumentation And Techniques

Scientific paper

We report on the status of the five resonant-mass detectors of gravitational waves operating today in Australia, Italy and USA. These bar detectors are in continuous observational mode with burst sensitivity h~=4×10-19, or, in spectral units, 2×10-22 Hz-1/2 over bandwidths of about 1 Hz, with a duty cycle mainly limited by cryogenic operations. The strongest potential sources of GW bursts in our Galaxy and in the local group are today monitored by such instruments. With the formation of the IGEC (International Gravitational Event Collaboration), the activity on bar detectors passed a phase transition: from the occasional exchange of data between two groups to the systematic exchange of data between all the groups, following an agreed protocol. In addition to the search for impulsive events, the data collected are being used to detect periodic waves over long time periods, to give new upper limits for the stochastic background of cosmological origin, and to study possible correlations with gamma ray bursts. .

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