TY - JOUR AU - Pierre Auger Collaboration (Abreu, P. et al AU - Pastor, S. PY - 2011 DA - 2011// TI - The exposure of the hybrid detector of the Pierre Auger Observatory T2 - Astropart Phys. JO - Astroparticle Physics SP - 368 EP - 381 VL - 34 IS - 6 PB - Elsevier Science Bv KW - Ultra high energy cosmic rays KW - Pierre Auger Observatory KW - Extensive air showers KW - Trigger KW - Exposure KW - Fluorescence detector KW - Hybrid AB - The Pierre Auger Observatory is a detector for ultra-high energy cosmic rays. It consists of a surface array to measure secondary particles at ground level and a fluorescence detector to measure the development of air showers in the atmosphere above the array. The "hybrid" detection mode combines the information from the two subsystems. We describe the determination of the hybrid exposure for events observed by the fluorescence telescopes in coincidence with at least one water-Cherenkov detector of the surface array. A detailed knowledge of the time dependence of the detection operations is crucial for an accurate evaluation of the exposure. We discuss the relevance of monitoring data collected during operations, such as the status of the fluorescence detector, background light and atmospheric conditions, that are used in both simulation and reconstruction. SN - 0927-6505 UR - http://arxiv.org/abs/arXiv:1010.6162 UR - https://doi.org/10.1016/j.astropartphys.2010.10.001 DO - 10.1016/j.astropartphys.2010.10.001 LA - English N1 - ISI:000287068800007 ID - PierreAugerCollaborationAbreu+Pastor2011 ER -