1. Department of Physics & Astronomy, University of British Columbia , Vancouver, BC V6T 1Z4 , Canada
2. Dipartimento di Fisica e Astronomia, Università degli Studi di Padova , Via Marzolo 8, I-35131 Padova , Italy
3. Mullard Space Science Laboratory, University College London , Holmbury St Mary, Dorking, Surrey RH5 6NT , UK
4. INAF Osservatorio Astronomico di Roma , Via Frascati 33, I-00078 Monte Porzio Catone (RM) , Italy
5. MIT Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , 77 Massachusetts Avenue, Cambridge, MA 02139 , USA
6. Institut de Recherche en Astrophysique et Planétologie , UPS-OMP, CNRS, CNES, 9 avenue du Colonel Roche, F-BP 44346 31028 Toulouse CEDEX 4 , France
7. Cahill Astrophysics, California Institute of Technology , Pasadena, CA 91125 , USA
8. NASA Marshall Space Flight Center , Huntsville, AL 35812 , USA
9. Department of Physics and Astronomy, Louisiana State University , Baton Rouge, LA 70803 , USA
10. Instituto de Astrofísica de Andalucía , CSIC, Glorieta de la Astronomía s/n, E-18008 Granada , Spain
11. Space Science Data Center, Agenzia Spaziale Italiana , Via del Politecnico snc, I-00133 Roma , Italy
12. INAF Osservatorio Astronomico di Cagliari , Via della Scienza 5, I-09047 Selargius (CA) , Italy
13. Istituto Nazionale di Fisica Nucleare , Sezione di Pisa, Largo B. Pontecorvo 3, I-56127 Pisa , Italy
14. Dipartimento di Fisica, Università di Pisa , Largo B. Pontecorvo 3, I-56127 Pisa , Italy
15. Dipartimento di Matematica e Fisica, Università degli Studi Roma Tre , Via della Vasca Navale 84, I-00146 Roma , Italy
16. Istituto Nazionale di Fisica Nucleare, Sezione di Torino , Via Pietro Giuria 1, I-10125 Torino , Italy
17. Dipartimento di Fisica, Università degli Studi di Torino , Via Pietro Giuria 1, I-10125 Torino , Italy
18. INAF Osservatorio Astrofisico di Arcetri , Largo Enrico Fermi 5, I-50125 Firenze , Italy
19. Dipartimento di Fisica e Astronomia, Università degli Studi di Firenze , Via Sansone 1, I-50019 Sesto Fiorentino (FI) , Italy
20. Istituto Nazionale di Fisica Nucleare, Sezione di Firenze , Via Sansone 1, I-50019 Sesto Fiorentino (FI) , Italy
21. INAF Istituto di Astrofisica e Planetologia Spaziali , Via del Fosso del Cavaliere 100, I-00133 Roma , Italy
22. ASI – Agenzia Spaziale Italiana , Via del Politecnico snc, I-00133 Roma , Italy
23. Science and Technology Institute, Universities Space Research Association , Huntsville, AL 35805 , USA
24. Istituto Nazionale di Fisica Nucleare, Sezione di Roma ‘Tor Vergata’ , Via della Ricerca Scientifica 1, I-00133 Roma , Italy
25. Department of Physics and Kavli Institute for Particle Astrophysics and Cosmology, Stanford University , Stanford, CA 94305 , USA
26. Institut für Astronomie und Astrophysik, Universität Tübingen , Sand 1, D-72076 Tübingen , Germany
27. Astronomical Institute of the Czech Academy of Sciences , Boční II 1401/1, CZ-14100 Praha 4 , Czech Republic
28. RIKEN Cluster for Pioneering Research , 2-1 Hirosawa, Wako, Saitama 351-0198 , Japan
29. NASA Goddard Space Flight Center , Greenbelt, MD 20771 , USA
30. Faculty of Science, Yamagata University , 1-4-12 Kojirakawa-machi, Yamagata-shi 990-8560 , Japan
31. Department of Earth and Space Science, Osaka University , 1-1 Yamadaoka, Suita, Osaka 565-0871 , Japan
32. International Center for Hadron Astrophysics, Chiba University , Chiba 263-8522 , Japan
33. Institute for Astrophysical Research , Boston University, 725 Commonwealth Avenue, Boston, MA 02215 , USA
34. Department of Astrophysics, St. Petersburg State University , Universitetsky pr. 28, Petrodvoretz, 198504 St. Petersburg , Russia
35. Department of Physics and Astronomy and Space Science Center, University of New Hampshire , Durham, NH 03824 , USA
36. Physics Department and McDonnell Center for the Space Sciences, Washington University in St. Louis , St. Louis, MO 63130 , USA
37. Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, Strada Comunale Cinthia , I-80126 Napoli , Italy
38. Université de Strasbourg, CNRS, Observatoire Astronomique de Strasbourg , UMR 7550, F-67000 Strasbourg , France
39. Graduate School of Science, Division of Particle and Astrophysical Science, Nagoya University , Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602 , Japan
40. Hiroshima Astrophysical Science Center, Hiroshima University , 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526 , Japan
41. Department of Physics, The University of Hong Kong , Pokfulam , 999077 Hong Kong
42. Department of Astronomy and Astrophysics, Pennsylvania State University , University Park, PA 16802 , USA
43. Université Grenoble Alpes , CNRS, IPAG, F-38000 Grenoble , France
44. Department of Physics and Astronomy , University of Turku, Turku FI-20014 , Finland
45. Center for Astrophysics, Harvard and Smithsonian , 60 Garden St, Cambridge, MA 02138 , USA
46. INAF Osservatorio Astronomico di Brera , Via E. Bianchi 46, I-23807 Merate (LC) , Italy
47. Dipartimento di Fisica, Università degli Studi di Roma ‘Tor Vergata’ , Via della Ricerca Scientifica 1, I-00133 Roma , Italy
48. Department of Astronomy, University of Maryland , College Park, MD 20742 , USA
49. Anton Pannekoek Institute for Astronomy and GRAPPA, University of Amsterdam , Science Park 904, NL-1098 XH Amsterdam , the Netherlands
50. Guangxi Key Laboratory for Relativistic Astrophysics, School of Physical Science and Technology, Guangxi University , Nanning 530004 , China