Yes, in around 1997 I believe. http://www.nature.com/nature/journal/v396/n6708/full/396233a0.html?foxtrotcallback=true http://www.nature.com/nature/journal/v39

Yes, in around 1997 I believe. http://www.nature.com/nature/journal/v396/n6708/full/396233a0.html?foxtrotcallback=true http://www.nature.com/nature/journal/v396/n6708/full/396233a... My read is that the news here is that this is the first visual counterpart to a gravitational wave detection. (It's also very strong supporting evidence for the leading theory that neutron stars merging are sources of those gravitational waves.)