1. Institute for Gravitational Wave Astronomy and School of Physics and Astronomy, University of Birmingham , Birmingham B15 2TT , UK
2. Astrophysics Research Centre, School of Mathematics and Physics, Queen’s University Belfast , Belfast BT7 1NN , UK
3. The Oskar Klein Centre, Department of Astronomy, Stockholm University , AlbaNova, SE-10691 Stockholm , Sweden
4. Space Telescope Science Institute , 3700 San Martin Dr, Baltimore, MD 21218 , USA
5. Department of Physics, University of Oxford , Denys Wilkinson Building, Keble Road, Oxford OX1 3RH , UK
6. DTU Space, National Space Institute, Technical University of Denmark , Elektrovej 327, DK-2800 Kgs. Lyngby , Denmark
7. European Southern Observatory , Alonso de Córdova 3107, Casilla 19, Santiago , Chile
8. Millennium Institute of Astrophysics MAS , Nuncio Monsenor Sotero Sanz 100, Off. 104, Providencia, Santiago , Chile
9. Center for Astrophysics | Harvard & Smithsonian , Cambridge, MA 02138 , USA
10. Institute for Astronomy, University of Hawaii , 2680 Woodlawn Drive, Honolulu, HI 96822 , USA
11. TUM School of Natural Sciences, Physik-Department, Technische Universität München , James-Franck-Straße 1, D-85748 Garching , Germany
12. Institute of Space Sciences (ICE, CSIC) , Campus UAB, Carrer de Can Magrans, s/n, E-08193 Barcelona , Spain
13. Institut d’Estudis Espacials de Catalunya (IEEC) , E-08034 Barcelona , Spain
14. Departamento de Física, Universitat Autònoma de Barcelona , E-08193 Bellaterra, Barcelona , Spain
15. Astronomical Observatory, University of Warsaw , Al. Ujazdowskie 4, PL-00-478 Warszawa , Poland
16. Cardiff Hub for Astrophysics Research and Technology, School of Physics & Astronomy, Cardiff University , Queens Buildings, The Parade, Cardiff CF24 3AA , UK
17. Max-Planck-Institut für Astrophysik , Karl-Schwarzschild Straße 1, D-85748 Garching , Germany
18. Astrophysics Research Institute, Liverpool John Moores University , IC2, Liverpool Science Park, 146 Brownlow Hill, Liverpool L3 5RF , UK
19. Department of Physics and Astronomy, The Johns Hopkins University , Baltimore, MD 21218 , USA
20. School of Physics, Trinity College Dublin, The University of Dublin , Dublin 2, D02 PN40 , Ireland
21. Isaac Newton Group (ING) , Apt. de correos 321, E-38700 Santa Cruz de La Palma, Canary Islands , Spain