It is fascinating, and I learned that one of the events was first detected by an unmodeled search for strange events in the signals:

"Finally, LIGO runs 'unmodelled' searches, which do not search for specific signals, but instead look for any coherent non-Gaussian behaviour in the observatories. These searches actually were the first to find GW150914, and did so with remarkably consistent parameters to the modelled searches..."

http://www.preposterousuniverse.com/blog/2017/06/18/a-respon...