Trigger and aperture of the surface detector array of the Pierre Auger Observatory

Ahn E.J. Centro Atómico Bariloche, Instituto Balseiro (CNEA-UNCuyo-CONICET), San Carlos de Bariloche, Argentina|

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Institute for Nuclear Science and Technology (INST), Hanoi, Viet Nam| De Donato C. University of Wisconsin, Milwaukee, WI, United States| De Domenico M. University of Wisconsin, Madison, WI, United States| de Almeida R.M. University of New Mexico, Albuquerque, NM, United States| Dawson B.R. University of Nebraska, Lincoln, NE, United States| Daumiller K. University of Hawaii, Honolulu, HI, United States| Dallier R. University of Chicago, Enrico Fermi Institute, Chicago, IL, United States| Dagoret-Campagne S. University of California, Los Angeles, CA, United States| Curutiu A. Southern University, Baton Rouge, LA, United States| Cronin J. Pennsylvania State University, University Park, PA, United States| Criss A. Ohio State University, Columbus, OH, United States| Creusot A. Northeastern University, Boston, MA, United States| Covault C.E. New York University, New York, NY, United States| Coutu S. Michigan Technological University, Houghton, MI, United States| Cotti U. 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Laboratory for Astroparticle Physics, University of Nova Gorica, Slovenia| Cester R. J. Stefan Institute, Ljubljana, Slovenia| Cazon L. LIP, Instituto Superior Técnico, Lisboa, Portugal| Cataldi G. University of łódź, łódź, Poland| Catalano O. Institute of Nuclear Physics PAN, Krakow, Poland| Castellina A. ASTRON, Dwingeloo, Netherlands| Caruso R. NIKHEF, Amsterdam, Netherlands| Caramete L. Kernfysisch Versneller Instituut, University of Groningen, Groningen, Netherlands| Caballero-Mora K.S. IMAPP, Radboud University, Nijmegen, Netherlands| Busca N.G. Universidad Nacional Autonoma de Mexico, Mexico, D.F., Mexico| Burton R.E. Universidad Michoacana de San Nicolas de Hidalgo, Morelia, Michoacan, Mexico| Bueno A. Centro de Investigación y de Estudios Avanzados, IPN (CINVESTAV), México, D.F., Mexico| Buchholz P. Benemérita Universidad Autónoma de Puebla, Puebla, Mexico| Bruijn R. Università di Palermo, Sezione INFN, Catania, Italy| Brown W.C. INFN, Laboratori Nazionali del Gran Sasso, Assergi, L'Aquila, Italy| Brogueira P. Istituto di Fisica dello Spazio Interplanetario (INAF), Università di Torino, Sezione INFN, Torino, Italy| Brack J. Istituto di Astrofisica Spaziale e Fisica Cosmica di Palermo (INAF), Palermo, Italy| Borodai N. Gran Sasso Center for Astroparticle Physics, Italy| Bonino R. Dipartimento di Ingegneria dell'Innovazione dell'Università del Salento, Sezione INFN, Lecce, Italy| Bonifazi C. Università di Torino, Sezione INFN, Torino, Italy| Boncioli D. Università di Catania, Sezione INFN, Catania, Italy| Boháčová M. Università di Roma II Tor Vergata, Sezione INFN, Roma, Italy| Blümer H. Università di Napoli Federico II, Sezione INFN, Napoli, Italy| Bleve C. Dipartimento di Fisica dell'Università del Salento, Sezione INFN, Lecce, Italy| Blanco M. Università di Milano, Sezione INFN, Milan, Italy| Blanco F. Università dell'Aquila, INFN, L'Aquila, Italy| Blanch-Bigas O. Dipartimento di Fisica dell'Università, INFN, Genova, Italy| Billoir P. Universität Siegen, Siegen, Germany| Biermann P.L. Universität Hamburg, Hamburg, Germany| Bertou X. RWTH Aachen University, III. Physikalisches Institut A, Aachen, Germany| Bergmann T. Max-Planck-Institut für Radioastronomie, Bonn, Germany| Berat C. Karlsruhe Institute of Technology - Campus South, Institut für Experimentelle Kernphysik (IEKP), Karlsruhe, Germany| BenZvi S. Karlsruhe Institute of Technology - Campus North, Institut für Prozessdatenverarbeitung und Elektronik, Karlsruhe, Germany| Bellido J.A. Karlsruhe Institute of Technology - Campus North, Institut für Kernphysik, Karlsruhe, Germany| Bellétoile A. Bergische Universität Wuppertal, Wuppertal, Germany| Becker K.H. SUBATECH, CNRS-IN2P3, Nantes, France| Becker B.R. Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier, INPG, Grenoble, France| Beatty J.J. Laboratoire de Physique Nucléaire et de Hautes Energies (LPNHE), Universités Paris 6 et Paris 7, CNRS-IN2P3, Paris, France| Bauleo P. Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris 11, CNRS-IN2P3, Orsay, France| Baughman B. Laboratoire AstroParticule et Cosmologie (APC), Université Paris 7, CNRS-IN2P3, Paris, France| Barroso S.L.C. Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris 11, CNRS-IN2P3, Orsay, France| Barbosa A.F. Palacký University, Olomouc, Czech Republic| Barber K.B. Institute of Physics, the Academy of Sciences of the Czech Republic, Prague, Czech Republic| Balzer M. Charles University, Faculty of Mathematics and Physics, Institute of Particle and Nuclear Physics, Prague, Czech Republic| Badagnani D. Rudjer Bošković Institute, 10000 Zagreb, Croatia| Bäcker T. Universidade Federal do Rio de Janeiro, Instituto de Física, Rio de Janeiro, RJ, Brazil| Avila G. Universidade Federal, ABC, Santo André, SP, Brazil| Ave M. Universidade Federal da Bahia, Salvador, BA, Brazil| Aublin J. Universidade Estadual do Sudoeste da Bahia, Vitoria da Conquista, BA, Brazil| Assis P. Universidade Estadual de Feira de Santana, Brazil| Asorey H. Universidade Estadual de Campinas, IFGW, Campinas, SP, Brazil| Arqueros F. Universidade de São Paulo, Instituto de Física, São Paulo, SP, Brazil| Arisaka K. Universidade de São Paulo, Instituto de Física, São Carlos, SP, Brazil| Arganda E. Pontifícia Universidade Católica, Rio de Janeiro, RJ, Brazil| Aramo C. Centro Brasileiro de Pesquisas Fisicas, Rio de Janeiro, RJ, Brazil| Anzalone A. University of Adelaide, Adelaide, SA, Australia| Antičić T. Pierre Auger Southern Observatory and Comisión Nacional de Energía Atómica, Malargüe, Argentina| Andringa S. Pierre Auger Southern Observatory, Malargüe, Argentina| Anchordoqui L. National Technological University, Faculty Mendoza (CONICET/CNEA), Mendoza, Argentina| Ambrosio M. Instituto de Astronomía y Física del Espacio (CONICET), Buenos Aires, Argentina| Alvarez-Muñiz J. IFLP, Universidad Nacional de La Plata, CONICET, La Plata, Argentina| Allen J. Departamento de Física, FCEyN, Universidad de Buenos Aires, Argentina| Allekotte I. Centro de Investigaciones en Láseres y Aplicaciones, CITEFA, CONICET, Argentina| Allard D. Centro Atomico Constituyentes (Comision Nacional de Energia Atomica/CONICET/UTN-FRBA), Buenos Aires, Argentina|