2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/187605The diffraction effects on gravitational waves propagating through a stellar cluster are analyzed in the relevant approximation of Fresnel diffraction limit. We find that a gravitational wave scintillation effect - similar to the radio source scintillation effect - comes out naturally, implying that the gravitational wave intensity changes in a characteristic way as the observer moves.9 pages, in press in IJMP DAstrophysicstext