1. Nordita, Stockholm University and KTH Royal Institute of Technology, Hannes Alfvéns väg 12 , SE-106 91 Stockholm , Sweden
2. The Oskar Klein Centre, Department of Physics, Stockholm University , AlbaNova, SE-106 91 Stockholm , Sweden
3. School of Physics, University of Melbourne , Parkville, Victoria 3010 , Australia
4. OzGrav: The ARC Centre of Excellence for Gravitational Wave Discovery, University of Melbourne , Parkville, Victoria 3010 , Australia
5. The Oskar Klein Centre, Department of Astronomy, Stockholm University , AlbaNova, SE-106 91 Stockholm , Sweden
6. Leonard E. Parker Center for Gravitation, Cosmology, and Astrophysics, University of Wisconsin-Milwaukee , Milwaukee, WI 53201 , USA
7. Observatoire de la Côte d’Azur, CNRS, Laboratoire Lagrange , Université Côte d’Azur, Bd de l’Observatoire, F-06304 Nice , France
8. Observatoire de la Côte d’Azur, CNRS, Artemis, Université Côte d’Azur, Bd de l’Observatoire , F-06304 Nice , France
9. Department of Physics, University of Bath, Claverton Down , Bath, BA2 7AY , UK
10. Astrophysics Research Institute, Liverpool John Moores University , IC2 Liverpool Science Park, 146 Brownlow Hill, Liverpool, L3 5RF , UK
11. Institute of Astronomy, National Tsing Hua University , Hsinchu 30013 , Taiwan