Search for Gamma Ray Bursts at Sierra Negra, México.

We present results from a search for GRBs in the energy range from tens of GeVs to one TeV with an array of 6 water Cherenkov detectors located at 4500 m a.s.l. as part of the high mountain observatory of Sierra Negra (N18°59.1, W97° 18.76) near Puebla city in México. The detectors consist of light-tight cylindrical containers of 1 m2 cross section filled with 750 l of purified water; they are spaced 25 m and have a 5" photomultiplier (EMI model 9030A) facing down along the cylindrical axis. We describe preliminary experimental results obtained by using a single-particle counting technique for a data taking period of 58 days. [ABSTRACT FROM AUTHOR]