tokens: ACKNOWLEDGEMENTS Parts of this research were conducted by the Australian Research Council Centre of Excellence for Gravitational Wave Discovery (OzGrav), through project number CE170100004. EJH acknowledges support from an Australian Research Council DECRA Fellowship (DE170100891). The authors gratefully thank Raymond Frey (University of Oregon), the assigned reviewer for the LIGO Scientific Collaboration, for conducting a thorough review of the manuscript that included a number of insightful suggestions. We are also particularly grateful to Giulia Stratta (INAF/OAS), who provided some useful comments to improve the manuscript. We also thank Aaron Tohuvavohu of the Neil Gehrels Swift Observatory ( Swift ) for useful discussions on the follow-up capabilities of Swift . Finally, we thank the anonymous referee for a thorough reading of the manuscript and for providing a number of erudite suggestions that have enriched the paper. This paper has LIGO document ID P1800322.
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