1. Thüringer Landessternwarte , Sternwarte 5, D-07778 Tautenburg, Germany
2. CSIRO Space and Astronomy , ATNF, PO Box 1130, Bentley, WA 6102, Australia
3. INAF-IRA , Via P. Gobetti 101, I-40129 Bologna, Italy
4. Department of Physics, University of Wisconsin–Milwaukee , PO Box 413, Milwaukee, WI 53201, USA
5. CSIRO Space and Astronomy , ATNF, PO Box 76, Epping, NSW 1710, Australia
6. School of Science, Western Sydney University , Locked Bag 1797, Penrith, NSW 2751, Australia
7. Department of Astronomy, University of Cape Town , 7701 Rondebosch, Cape Town, South Africa
8. Inter-university Institute for Data Intensive Astronomy, Department of Physics and Astronomy, University of the Western Cape , Robert Sobukwe Road, 7535 Bellville, Cape Town, South Africa
9. International Centre for Radio Astronomy Research (ICRAR), University of Western Australia , Crawley, WA 6009, Australia
10. Centre for Astrophysics and Supercomputing, Swinburne University of Technology , Hawthorn, VIC 3122, Australia
11. ASTRON: the Netherlands Institute for Radio Astronomy , PO Box 2, NL-7990 AA Dwingeloo, the Netherlands
12. School of Physics and Astronomy, Monash University , Clayton, VIC 3800, Australia
13. School of Natural Sciences, University of Tasmania , Private Bag 37, Hobart, TAS 7001, Australia
14. Departamento de Astronomía, DCNE, Universidad de Guanajuato , Callejón. de Jalisco s/n, Guanajuato, CP 36023, Mexico
15. Australian Astronomical Optics, Macquarie University , 105 Delhi Road, North Ryde, NSW 2113, Australia
16. Department of Physics and Astronomy, University of Calgary , Calgary, AB T2N 1N4, Canada
17. Center for Theoretical Physics, Polish Academy of Sciences , al. Lotników 32/46, PL-02-668 Warsaw, Poland
18. International Centre for Radio Astronomy Research – Curtin University , 1 Turner Avenue, Bentley, WA 6102, Australia
19. Shanghai Astronomical Observatory, Chinese Academy of Sciences , Nandan road 80, Shanghai 200030, China
20. Key Laboratory of Cognitive Radio and Information Processing, Guilin University of Electronic Technology , Guilin 541004, China