Primary black hole spin in OJ287 as determined by the General Relativity   centenary flare
  OJ287 is a quasi-periodic quasar with roughly 12 year optical cycles. It displays prominent outbursts which are predictable in a binary black hole model. The model predicted a major optical outburst in December 2015. We found that the outburst did occur within the expected time range, peaking on 2015 December 5 at magnitude 12.9 in the optical R-band. Based on Swift/XRT satellite measurements and optical polarization data, we find that it included a major thermal component. Its timing provides an accurate estimate for the spin of the primary black hole, chi = 0.313 +- 0.01. The present outburst also confirms the established general relativistic properties of the system such as the loss of orbital energy to gravitational radiation at the 2 % accuracy level and it opens up the possibility of testing the black hole no-hair theorem with a 10 % accuracy during the present decade. 
M. J. Valtonen, S. Zola, S. Ciprini, A. Gopakumar, K. Matsumoto, K.   Sadakane, M. Kidger, K. Gazeas, K. Nilsson, A. Berdyug...
astro-ph.HE