Detecting gamma-ray bursts with the Pierre Auger Observatory using the   single particle technique
  During the past ten years, gamma-ray bursts (GRB) have been extensively studied in the keV-MeV energy range but the high energy emission still remain mysterious. Ground based observatories have the possibility to investigate energy range around one GeV using the "single particle technique". The aim of the present study is to investigate the capability of the Pierre Auger Observatory to detect the high energy emission of GRBs with such a technique. According to the detector response to photon showers around one GeV, and making reasonable assumptions about the high energy emission of GRBs, we show that the Pierre Auger Observatory is a competitive instrument for this technique, and that water tanks are very promising detectors for the single particle technique. 
D. Allard, E. Parizot, X. Bertou, J. Beatty, M. Du Vernois, D. Nitz,   G. Rodriguez (for the Pierre Auger collaboration)