Although this PRL does not cite, there is another analytical study in this sense -> https://iopscience.iop.org/article/10.1088/1475-7516/2018/02/030/meta
https://arxiv.org/abs/1706.07704
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RT @RobertGaristo@twitter.com
"Analytical black-hole binary merger waveforms" @PhysRevLett https://journals.aps.org/prl/accepted/9e079Y61J231ab65811c6885ec7ede36ffffe5c5d https://twitter.com/hadriancho/status/1124034814804406272
https://twitter.com/RobertGaristo/status/1124047011328798724