First observations of speed of light tracks by a fluorescence detector looking down on the atmosphere

Abdellaoui G;Abe S;Acheli A;Adams JH;Ahmad S;Ahriche A;Albert JN;Allard D;Alonso G;Anchordoqui L;Andreev V;Anzalone A;Aouimeur W;Arai Y;Arsene N;Asano K;Attallah R;Attoui H;Pernas MA;Bacholle S;Bakiri M;Baragatti P;Barrillon P;Bartocci S;Batsch T;Bayer J;Bechini R;Belenguer T;Bellotti R;Belov A;Belov K;Benadda B;Benmessai K;Berlind AA;Bertaina M;Biermann PL;Biktemerova S;Bisconti F;Blanc N;Blecki J;Blin-Bondil S;Bobik P;Bogomilov M;Bonamente M;Boudaoud R;Bozzo E;Briggs MS;Bruno A;Caballero KS;Cafagna F;Campana D;Capdevielle JN;Capel F;Caramete A;Caramete L;Carlson P;Caruso R;Casolino M;Cassardo C;Castellina A;Castellini G;Catalano C;Catalano O;Cellino A;Chikawa M;Chiritoi G;Christl MJ;Connaughton V;Conti L;Contino G;Cordero G;Cotto G;Crawford HJ;Cremonini R;Csorna S;Dagoret-Campagne S;De Donato C;de la Taille C;De Santis C;del Peral L;Di Martino M;Djemil T;Djenas SA;Dulucq F;Dupieux M;Dutan I;Ebersoldt A;Ebisuzaki T;Engel R;Eser J;Fang K;Fenu F;Fernandez-Gonzalez S;Fernandez-Soriano J;Ferrarese S;Finco D;Flamini M;Fornaro C;Forza R;Fouka M;Franceschi A;Franchini S;Fuglesang C;Fujimoto J;Fukushima M;Galeotti P;Garcia-Ortega E;Garipov G;Gascon E;Geary J;Gelmini G;Genci J;Giraudo G;Gonchar M;Alvarado CG;Gorodetzky P;Guardone N;Guarino F;Guehaz R;Guzman A;Hachisu Y;Haiduc M;Harlov B;Haungs A;Carretero JH;Hidber W;Higashide K;Ikeda D;Ikeda H;Inoue N;Inoue S;Insolia A;Isgro F;Itow Y;Jammer T;Joven E;Judd EG;Jung A;Jochum J;Kajino F;Kajino T;Kalli S;Kaneko I;Kang D;Kanouni F;Karadzhov Y;Karczmarczyk J;Karus M;Katahira K;Kawai K;Kawasaki Y;Kedadra A;Khales H;Khrenov BA;Kim JS;Kim SW;Kim SW;Kleifges M;Klimov PA;Kolev D;Kreykenbohm I;Kudela K;Kurihara Y;Kusenko A;Kuznetsov E;Lacombe M;Lachaud C;Lahmar H;Lakhdari F;Larsson O;Lee J;Licandro J;Lim H;Campano LL;Maccarone MC;Mackovjak S;Mahdi M;Manfrin M;Maravilla D;Marcelli L;Marcos JL;Marini A;Martens K;Martin Y;Martinez O;Masciantonio G;Mase K;Matev R;Matthews JN;Mebarki N;Medina-Tanco G;Mehrad L;Mendoza MA;Merino A;Mernik T;Meseguer J;Messaoud S;Micu O;Mignone M;Mimouni J;Miyamoto H;Miyazaki Y;Mizumoto Y;Modestino G;Monaco A;Monnier-Ragaigne D;de los Rios JAM;Moretto C;Morozenko VS;Mot B;Murakami T;Nadji B;Nagano M;Nagata M;Nagataki S;Nakamura T;Napolitano T;Naumov D;Nava R;Neronov A;Nomoto K;Nonaka T;Ogawa T;Ogio S;Ohmori H;Olinto AV;Orleanski P;Osteria G;Painter W;Panasyuk MI;Panico B;Parizot E;Park IH;Park HW;Pastircak B;Patzak T;Paul T;Pennypacker C;Perez-Grande I;Perfetto F;Peter T;Picozza P;Pierog T;Pindado S;Piotrowski LW;Piraino S;Placidi L;Plebaniak Z;Pliego S;Pollini A;Popescu EM;Prat P;Prevot G;Prieto H;Putis M;Rabanal J;Radu AA;Rahmani M;Reardon P;Reyes M;Rezazadeh M;Ricci M;Frias MDR;Ronga F;Roth M;Rothkaehl H;Roudil G;Rusinov I;Rybczynski M;Sabau MD;Cano GS;Sagawa H;Sahnoune Z;Saito A;Sakaki N;Sakata M;Salazar H;Sanchez JC;Sanchez JL;Santangelo A;Cruz LS;Sanz-Andres A;Palomino MS;Saprykin O;Sarazin F;Sato H;Sato M;Schanz T;Schieler H;Scotti V;Segreto A;Selmane S;Semikoz D;Serra M;Sharakin S;Shibata T;Shimizu HM;Shinozaki K;Shirahama T;Siemieniec-Ozieblo G;Sledd J;Slominska K;Sobey A;Stan I;Sugiyama T;Supanitsky D;Suzuki M;Szabelska B;Szabelski J;Tahi H;Tajima F;Tajima N;Tajima T;Takahashi Y;Takami H;Takeda M;Takizawa Y;Talai MC;Tenzer C;Tibolla O;Tkachev L;Tokuno H;Tomida T;Tone N;Toscano S;Traiche M;Tsenov R;Tsunesada Y;Tsuno K;Tymieniecka T;Uchihori Y;Unger M;Vaduvescu O;Valdes-Galicia JF;Vallania P;Vankova G;Vigorito C;Villasenor L;Vlcek B;von Ballmoos P;Vrabel M;Wada S;Watanabe J;Watanabe S;Watts J;Weber M;Munoz RW;Weindl A;Weiler TJ;Wibig T;Wiencke L;Wille M;Wilms J;Wlodarczyk Z;Yamamoto T;Yamamoto Y;Yang J;Yano H;Yashin IV;Yonetoku D;Yoshida S;Young R;Zgura IS;Zotov MY;Marchi AZ

2018-01-01