1. Department of Physics, University of Western Australia, Crawley, WA 6009, Australia
2. School of Science, University of New South Wales, Australian Defence Force Academy, Canberra, ACT 2600, Australia
3. Australian Research Council Centre of Excellence for Gravitational Wave Discovery (OzGrav), Australia
4. Center for Astrophysics and Space Sciences, University of California, San Diego, 9500 Gilman Dr., La Jolla, CA 92093-0424, USA
5. Astrophysics Research Centre, School of Mathematics and Physics, Queen’s University Belfast, Belfast BT7 1NN, UK
6. The Research School of Astronomy and Astrophysics, Mount Stromlo Observatory, Australian National University, Canberra, ACT 2611, Australia