Implications of the predicted General Relativity Centenary flare in Blazar OJ287

OJ287 is the most promising candidate for a spinning supermassive black hole binary that spirals in due to gravitational wave emission. This deduction is based on the fact that OJ287 exhibits prominent outbursts that are inherent in such an binary black hole model. Few years ago, detailed General Relativistic modeling allowed us to predict a major optical outburst during November 2015. The outburst did occur within the expected time range, peaking on 2015 December 5. An observational campaign that involved two dozen optical observatories and the SWIFT satellite revealed the presence of a major thermal component in the flare. The timing of this component provided an accurate measurement for the spin of the primary black hole for the first time. This accurate measurement opens up the possibility of employing sophisticated instruments to probe  General Relativistic properties of OJ287.