I believe there have been visual/radio detections correlated with LIGO detections. I couldn't find a more authoritative source, but did find at least one refere

I believe there have been visual/radio detections correlated with LIGO detections. I couldn't find a more authoritative source, but did find at least one reference in a Popular Mechanics[1] article. [1]: https://www.popularmechanics.com/space/deep-space/a28631/neutron-star-merger-gravitational-waves-fabric-of-space/ https://www.popularmechanics.com/space/deep-space/a28631/neu...