1. Max Planck Institut für Radioastronomie , Auf dem Hügel 69, D-53121, Bonn, Germany
2. INAF – Osservatorio Astronomico di Cagliari , Via della Scienza 5, I-09047, Selargius (CA), Italy
3. Department of Physics, Universitá di Cagliari , S.P. Monserrato-Sestu Km 0700, I-09042, Monserrato, Italy
4. South African Radio Astronomy Observatory , 2 Fir Street, Cape Town, 7925, South Africa
5. Centre for Astrophysics and Supercomputing, Swinburne University of Technology , Mail H39, PO Box 218, VIC 3122, Australia
6. ARC Center of Excellence for Gravitational Wave Discovery (OzGrav), Swinburne University of Technology , Mail H11, PO Box 218, VIC 3122, Australia
7. Jodrell Bank Centre for Astrophysics, Department of Physics and Astronomy, The University of Manchester , Manchester M13 9PL, UK
8. Institute for Radio Astronomy & Space Research, Auckland University of Technology , Private Bag 92006, Auckland 1142, New Zealand
9. Max-Planck-Institut für Gravitationsphysik (Albert-Einstein-Institut) , D-30167, Hannover, Germany
10. National Radio Astronomy Observatory , 520 Edgemont Road, Charlottesville, VA 22903, USA
11. National Astronomical Observatories, Chinese Academy of Sciences , A20 Datun Road, Chaoyang District, Beijing 100101, China