1. Departamento de Física Teórica, Módulo 15 Universidad Autónoma de Madrid, E-28049 Madrid, Spain
2. Centro de Investigación Avanzada en Física Fundamental (CIAFF), Universidad Autónoma de Madrid, E-28049 Madrid, Spain
3. International Centre for Radio Astronomy Research, The University of Western Australia, 35 Stirling Highway, Crawley, Western Australia 6009, Australia
4. School of Physics & Astronomy, University of Nottingham, Nottingham NG7 2RD, UK
5. Institute for Astronomy, School of Physics & Astronomy, The University of Edinburgh, Royal Observatory, Edinburgh EH9 3HJ, UK
6. University Observatory Munich, Scheinerstraße 1, D-81679 Munich, Germany
7. Max-Planck-Institute for Extraterrestrial Physics, Giessenbachstrasse 1, D-85748 Garching, Germany
8. Dipartimento di Fisica, Sezione di Astronomia, Universitá di Trieste, via Tiepolo 11, I-34143 Trieste, Italy
9. INAF - Osservatorio Astronomico di Trieste, via Tiepolo 11, I-34143 Trieste, Italy
10. INFN - Sezione di Trieste, via Valerio 2, I-34127 Trieste, Italy
11. Max-Planck Institute for Astrophysics, Karl-Schwarzschild-Strabetae 1, D-85741 Garching, Germany
12. Instituto de Física Teórica, (UAM/CSIC), Universidad Autónoma de Madrid, Cantoblanco, E-28049 Madrid, Spain
13. IFCA, Instituto de Física de Cantabria (UC-CSIC), Av. de Los Castros s/n, E-39005 Santander, Spain
14. School of Physics and Astronomy, Sun Yat-sen University, 519082 Zhuhai, China
15. Department of Astronomy, Shanghai Key Laboratory for Particle Physics and Cosmology, Shanghai Jiao Tong University, Shanghai 200240, China
16. IFSA Collaborative Innovation Center, and Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai 200240, China
17. Carnegie Observatories, 813 Santa Barbara Street, Pasadena, CA 91101, USA
18. Instituto de Astrofísica de La Plata (CCT La Plata, CONICET, UNLP), Paseo del Bosque s/n, B1900FWA, La Plata, Argentina
19. Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, Paseo del Bosque s/n, B1900FWA, La Plata, Argentina
20. Centre for Astrophysics and Supercomputing, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia
21. Department of Physics, Sapienza Università di Roma, p.le Aldo Moro 5, I-00185 Rome, Italy
22. Dipartimento di Fisica, Università di Roma Tor Vergata, via della Ricerca Scientifica 1, I-00133 Roma, Italy
23. South African Astronomical Observatory, PO Box 9, Observatory, Cape Town 7935, South Africa
24. Department of Physics and Astronomy, University of the Western Cape, Cape Town 7535, South Africa
25. INFN - Sezione di Roma, P.le A. Moro 2, I-00185 Roma, Italy
26. Dipartimento di Fisica - Università degli Studi di Torino, Via Pietro Giuria, 1, I-10125 Torino, Italy
27. INAF, Osservatorio di Astrofisica e Scienza dello Spazio, via Pietro Gobetti 93/3, I-40129 Bologna, Italy
28. INFN, Sezione di Bologna, viale Berti Pichat 6/2, I-40127 Bologna, Italy
29. Leibniz-Institut für Astrophysik, D-14482 Potsdam, Germany
30. Instituto de Astronomía y Física del Espacio (IAFE, CONICET-UBA), CC 67, Suc. 28, 1428, Buenos Aires, Argentina
31. Facultad de Ciencias Exactas y Naturales (FCEyN), Universidad de Buenos Aires (UBA), 1053, Buenos Aires, Argentina
32. Department of Astronomy & Astrophysics, University of Toronto, Toronto, Canada
33. Astro Space Centre of Lebedev Physical Institute, Russian Academy of Sciences, Profsoyuznaja 84/32, 117997 Moscow, Russia
34. Univ Lyon, Univ Lyon1, Ens de Lyon, CNRS, Centre de Recherche Astrophysique de Lyon UMR5574, F-69230, Saint-Genis-Laval, France
35. CNRS and UPMC Univ. Paris 06, UMR 7095, Institut d’Astrophysique de Paris, 98 bis Boulevard Arago, F-75014 Paris, France