Observing Dynamic State of River-Mouth Bar and its Control in the Yuragawa River

Sediment Transport and Morphodynamic

Search for large-scale coincidences of EAS in LAAS experiment

Abstract To search for signals from extreme short bursts in the universe, we have performed the large-scale coincidence analysis, using EAS data from five stations of the Large Area Air Shower (LAAS) group. By comparing arrival times and arrival directions of EAS detected at distant stations, coincident and parallel EAS pairs were extracted out of a sea of background cosmic rays. One of them was intriguingly observed from directions consistent with the Crab Nebula, a previously reported UHE γ-ray source. The preliminary results reported here allow the analysis techniques to be tested and demonstrate the potential of observations with the full operation of the network detector system as a cosmic ray interferometer