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Recent observational campaigns and theoretical investigations  strongly indicate the presence ofa spinning supermassive black hole binary that spirals in due to the emission ofnano-Hertz gravitational waves in bright blazar OJ 287.I will briefly describe these efforts while focusingon our August 2019 observations and their implications.Additionally, I will touch upon  our ongoing efforts, relevant to i) the Event Horizon Telescope consortium and ii) the International Pulsar Timing Array consortium, which aims to detect GWs from such massive BH systems in the near future.These efforts should be helpful in achieving persistent multi-messenger nano-Hz GW astronomy in the Square-Kilometre Array era.

Host: Xinyu Li