Reconstruction accuracy of the surface detector of the Pierre Auger Observatory

PIERRE AUGER COLLABORATION (J. ABRAHAM, ... , A. MARIAZZI, ET AL)

Merida, Mejico

Conferencia; 30th International Cosmic Ray Conference; 2007

The reconstruction of extensive air showers (arrival direction, core position andenergy estimation) by the surface detector (SD) of the Pierre Auger Observatory is discussed together with thecorresponding accuracy.We determine the angular reconstruction accuracy as a function of the stationmultiplicity: the resolution obtained by the SD only is in agreement with the one obtained from hybrid events,i.e., showers observed simultaneously by the fluorescence and the surface detectors.We discuss statistical and systematical uncertainties in the determination of thecore location and the signal at 1000 m from the core, S(1000), which is used to estimate the primary energy. Thereconstruction method takes into account the signals of the fired stations with their uncertainties and thethresholds for the "zero" signal stations. We use the lateral distribution function that is fitted to the data.