Candidate Electromagnetic Counterpart to the Binary Black Hole Merger Gravitational-Wave Event S190521g.

@article{Graham2020CandidateEC,
  title={Candidate Electromagnetic Counterpart to the Binary Black Hole Merger Gravitational-Wave Event S190521g.},
  author={Matthew J. Graham and K. E. S. Ford and Barry McKernan and Nicholas P. Ross and Daniel Stern and Kevin B Burdge and Michael W. Coughlin and S. George Djorgovski and Andrew J. Drake and D. Duev and Mansi M. Kasliwal and Ashish A. Mahabal and Sjoert van Velzen and Justin Belecki and Eric C. Bellm and Rick S. Burruss and S. Bradley Cenko and Virginia Cunningham and George Helou and Shrinivas R. Kulkarni and Frank J. Masci and Thomas. A. Prince and Daniel J. Reiley and Hector Rodriguez and Ben Rusholme and R. M. Smith and Maayane T. Soumagnac},
  journal={Physical review letters},
  year={2020},
  volume={124 25},
  pages={
          251102
        }
}
We report the first plausible optical electromagnetic counterpart to a (candidate) binary black hole merger. Detected by the Zwicky Transient Facility, the electromagnetic flare is consistent with expectations for a kicked binary black hole merger in the accretion disk of an active galactic nucleus [B. McKernan, K. E. S. Ford, I. Bartos et al., Astrophys. J. Lett. 884, L50 (2019)AJLEEY2041-821310.3847/2041-8213/ab4886] and is unlikely [<O(0.01%))] due to intrinsic variability of this source… 

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