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We present results of a search for a possible signal from small scale solartransient events (such as flares and interplanetary shocks) as well as possiblecounterparts to Gamma-Ray Burst (GRB) observed simultaneously by the Tupi muontelescope Niteroi-Brazil, 22.90S, 43.20W, 3 m above sea level) and the PierreAuger Observatory surface detectors (Malargue-Argentina, 69.30S, 35.30W,altitude 1400 m). Both cosmic ray experiments are located inside the SouthAtlantic Anomaly (SAA) region. Our analysis of several examples showssimilarities in the behavior of the counting rate of low energy (above 100 MeV)particles in association with the solar activity (solar flares andinterplanetary shocks). We also report an observation by the Tupi experiment ofthe enhancement of muons at ground level with a significance higher than 8sigma in the 1-sec binning counting rate (raw data) in close time coincidence(T-184 sec) with the Swift-BAT GRB110928B (trigger=504307). The GRB 110928Bcoordinates are in the field of view of the vertical Tupi telescope, and theburst was close to the MAXI source J1836-194. The 5-min muon counting rate inthe vertical Tupi telescope as well as publicly available data from Auger (15minutes averages of the scaler rates) show small peaks above the backgroundfluctuations at the time following the Swift-BAT GRB 110928B trigger. Inaccordance with the long duration trigger, this signal can possibly suggest along GRB, with a precursor narrow peak at T-184 sec.

Search for a simultaneous signal from small transient events in the Pierre Auger Observatory and the Tupi muon telescopes