original criticism: http://www.nbi.ku.dk/gravitational-waves/correlations.html
response: https://github.com/spxiwh/response_to_1706_04191/blob/master...
definitely click through the quanta article's links.. fascinating reads all the way down
"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...