[1] Dublin Inst Adv Studies, 31 Fitzwilliam Pl, Dublin 2, Ireland
[2] Max Planck Inst Kernphys, POB 103980, D-69029 Heidelberg, Germany
[3] RAU, High Energy Astrophys Lab, 123 Hovsep Emin St, Yerevan 0051, Armenia
[4] Heidelberg Univ, Landessternwarte, Konigstuhl, D-69117 Heidelberg, Germany
[5] Aix Marseille Univ, CNRS, CPPM, IN2P3, Marseille, France
[6] Inst Polytech Paris, CNRS, Lab Leprince Ringuet, Ecole Polytech, F-91128 Palaiseau, France
[7] Univ Namibia, Dept Phys, Private Bag 13301, Windhoek 10005, Namibia
[8] Northwest Univ, Ctr Space Res, ZA-2520 Potchefstroom, South Africa
[9] DESY, D-15738 Zeuthen, Germany
[10] Univ Witwatersrand, Sch Phys, 1 Jan Smuts Ave, ZA-2050 Johannesburg, South Africa
[11] Univ Paris, CNRS, Astroparticule & Cosmol, F-75013 Paris, France
[12] Linnaeus Univ, Dept Phys & Elect Engn, S-35195 Vaxjo, Sweden
[13] Univ Paris, Univ PSL, Observ Paris, Lab Univers & Theories,CNRS, F-92190 Meudon, France
[14] Univ Paris Diderot, Sorbonne Univ, Sorbonne Paris Cite,CNRS, Lab Phys Nucl & Hautes Energies,IN2P3,LPNHE, 4 Pl Jussieu, F-75252 Paris, France
[15] Univ Savoie Mt Blanc, Lab Annecy Phys Particules IN2P3, CNRS, F-74000 Annecy, France
[16] Univ Paris Saclay, IRFU, CEA, F-91191 Gif Sur Yvette, France
[17] Univ Warsaw, Astron Observ, Al Ujazdowskie 4, PL-00478 Warsaw, Poland
[18] Inst Fizyki Jadrowej PAN, Ul Radzikowskiego 152, PL-31342 Krakow, Poland
[19] Univ Oxford, Dept Phys, Denys Wilkinson Bldg,Keble Rd, Oxford OX1 3RH, England
[20] Univ Bordeaux, CNRS, LP2I Bordeaux, UMR 5797, F-33170 Bordeaux, France
[21] Univ Potsdam, Inst Phys & Astron, Karl Liebknecht Str 24-25, D-14476 Potsdam, Germany
[22] Univ Adelaide, Sch Phys Sci, Adelaide, SA 5005, Australia
[23] Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany
[24] Univ Montpellier, Lab Univers & Particules Montpellier, CNRS, IN2P3, CC 72,Pl Eugene Bataillon, F-34095 Montpellier 5, France
[25] Leopold Franzens Univ Innsbruck, Inst Astro & Teilchenphys, A-6020 Innsbruck, Austria
[26] Univ Hamburg, Inst Expt Phys, Luruper Chaussee 149, D-22761 Hamburg, Germany
[27] Uniwersytet Jagiellonski, Obserwatorium Astron, Ul Orla 171, PL-30244 Krakow, Poland
[28] Nicolaus Copernicus Univ, Inst Astron, Fac Phys Astron & Informat, Grudziadzka 5, PL-87100 Torun, Poland
[29] Polish Acad Sci, Nicolaus Copernicus Astron Ctr, Ul Bartycka 18, PL-00716 Warsaw, Poland
[30] Univ Tubingen, Inst Astron & Astrophys, Sand 1, D-72076 Tubingen, Germany
[31] Humboldt Univ, Inst Phys, Newtonstr 15, D-12489 Berlin, Germany
[32] Univ Free State, Dept Phys, POB 339, ZA-9300 Bloemfontein, South Africa
[33] Univ Leicester, Dept Phys & Astron, Univ Rd, Leicester LE1 7RH, Leics, England
[34] Univ Amsterdam, Astron Inst Anton Pannekoek, GRAPPA, Sci Pk 904, NL-1098 XH Amsterdam, Netherlands
[35] Yerevan Phys Inst, 2 Alikhanian Bros St, Yerevan 375036, Armenia
[36] Univ Tokyo, Kavli Inst Phys & Math Universe WPI, Univ Tokyo Inst Adv Study UTIAS, 5-1-5 Kashiwa No Ha, Kashiwa, Chiba 2778583, Japan
[37] Konan Univ, Dept Phys, 8-9-1 Okamoto, Kobe, Hyogo 6588501, Japan
[38] Rikkyo Univ, Dept Phys, 3-34-1 Nishi Ikebukuro,Toshima Ku, Tokyo 1718501, Japan