
Gravitational waves produce a time delay between the different images of a gravitational lens. The measurements of the time delay in the gravitational lens 0957{plus minus}561 put new limits on the amplitude of low-frequency gravitational waves {ital h}{lt}2{times}10{sup {minus}5}({nu}/(3{times}10{sup {minus}18} Hz)) in the frequency range 3{times}10{sup {minus}18} Hz{lt}{nu}. Future measurements of the time delay in other gravitational lenses may permit this limit to be improved.
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