It is fascinating! Have you heard of using Arecibo radio dish (Puerto Rico)to detect gravitational waves (ripples) coming from black holes? I believe it is the largest and most sensitive single-dish available for detecting pulsars.
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This observatory indeed managed to put bounds on gravitational waves in the nanohertz regime from the study of pulsars. It is different from hat LIGO and Virgo did, as this does not consist in a direct measurement of the black hole properties.