We present the results of gravitational radiation experiments with two 1400-kg antennas at ν₀=145 Hz. The square antennas, 1.65×{}1.65×{}0.19 m³, QM2.0×10⁵, with electrostatic transducers of β1.8×10^-3, have mean effective noise energy D̄0.034kTᵣ. The observed cross correlation of the outputs of the two detectors gives an upper limit for the relation between the mean energy spectrum density F(ν₀) and the daily occurrence rate ̇ \.NG of gravitational radiation pulses: F(ν₀) ̇ \.NG1/2<~(3.6_-1.4+1.0)×10⁶ J m^-2 Hz^-1 day^-.
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Hirakawa et al. (1975) studied this question.
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