1. Columbia University, Physics Department, New York
2. INFN Sezione di Perugia, Perugia
3. INFN Sezione di Napoli, Napoli
4. University of California, Department of Physics and Astronomy, Los Angeles, California
5. Center for Astrophysics — Harvard & Smithsonian, Cambridge, Massachusetts
6. Dipartimento Interateneo di Fisica dell’Università e del Politecnico di Bari, Bari
7. University of California, Santa Cruz Institute for Particle Physics, Department of Physics, Santa Cr
8. INFN Sezione di Pisa, Pisa
9. Washington University, Department of Physics, St. Louis, Missouri
10. INFN Sezione di Catania, Catania
11. Durham University, Department of Physics and Centre for Advanced Instrumentation, Durham
12. INAF IASF Palermo, Palermo
13. Columbia University, Department of Physics and Astronomy, Barnard College, New York
14. Yale University, Department of Astronomy, New Haven, Connecticut
15. Case Western Reserve University, Department of Physics, Cleveland, Ohio
16. Dipartimento di Fisica dell’Università degli Studi di Torino, Torino
17. LLR/Ecole Polytechnique, Palaiseau Cedex
18. California State University - East Bay, Department of Physics, Hayward, California
19. Deutsches Elektronen Synchrotron (DESY), Zeuthen
20. Georgia Institute of Technology, School of Physics & Center for Relativistic Astrophysics, Atlanta,
21. INAF Osservatorio Astronomico di Padova, Padova
22. Michigan State University, Department of Physics and Astronomy, East Lansing, Michigan
23. SUNY Maritime College, Science Department, Throggs Neck, New York
24. University of Alabama, Department of Physics and Astronomy, Tuscaloosa, Alabama
25. University of Utah, Department of Physics and Astronomy, Salt Lake City, Utah
26. Iowa State University, Department of Physics and Astronomy, Ames, Iowa
27. University of Leicester, Space Research Centre, Leicester
28. INFN Sezione di Bari, Bari
29. University of Wisconsin, Department of Physics and Wisconsin IceCube Particle Astrophysics Center, M
30. Pennsylvania State University, University Park, Pennsylvania
31. Nagoya University, Institute for Space–Earth Environmental Research and Kobayashi–Maskawa Institute
32. INFN Sezione di Torino, Torino
33. Subaru Telescope NAOJ, Hilo, Hawaii
34. Max-Planck-Institut für Kernphysik, Heidelberg
35. University of Chicago, Enrico Fermi Institute, Chicago, Illinois
36. Deutsches Elektronen-Synchrotron, Zeuthen
37. University of Minnesota, School of Physics and Astronomy, Minneapolis, Minnesota
38. Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen Centre for Astroparticle Physics, Erlang