Preliminary Analysis of Monocular HiRes Prototype Data

The HiRes prototype detector with 14 mirrors has been operational for more than two years. Some air showers are observed in coincidence with other detectors (CASA, MIA, FE2, HiRes2). However, here we examine the larger data set which includes showers observed by the HiRes prototype alone. We describe the analysis techniques of shower reconstruction for the monocular data. Preliminary distributions are reported. We have also done a pilot study search for point sources. 1. Geometrical reconstruction The shower track and the detector determine a plane called the "tra kd tector plane. " The technique for finding that plane is described by Bird et al.[1]. The track within the plane has to be determined by the phototube firing times in the monocular case. As the shower front moves in space, the tubes fire sequentially in time. The tube trigger times are related to the track geometry by the equation below Here ti is the trigger time for the ith tube, t0 is the time when the shower front passes the detector, Rp is the impact parameter (the shortest distance from the detector to the track), is th