LIGO has probably seen the collision of a black hole and neutron star. That would mean it has spotted all three types of cosmic event it was designed to
Source:
https://www.newscientist.com/article/2214172-ligo-may-have-seen-its-first-black-hole-and-neutron-star-collision/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home