1. Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK
2. OzGRav-Monash, Monash University, Clayton, VIC 3800, Australia
3. School of Physics & Astronomy, Monash University, Clayton, VIC 3800, Australia
4. Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH, UK
5. Instituto de Astrofísica de Canarias (IAC), E-38205 La Laguna, Tenerife, Spain
6. School of Physics & Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UK
7. Armagh Observatory & Planetarium, College Hill, Armagh BT61 9DG, UK
8. National Astronomical Research Institute of Thailand, 260 Moo 4, T. Donkaew, A. Maerim, Chiangmai 50180, Thailand
9. Department of Physics and Astronomy, University of Turku, FI-20014 Turku, Finland
10. University of Portsmouth, Portsmouth PO1 3FX, UK
11. Jodrell Bank Centre for Astrophysics, Department of Physics and Astronomy, The University of Manchester, Manchester M13 9PL, UK
12. Department of Astrophysics/IMAPP, Radboud University, PO Box 9010, NL-6500 GL Nijmegen, the Netherlands