Optical Observation and Discovery with All-sky Survey

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The purpose of this study is aimed for resolving out the energy dissipation mechanism in GRB objects from the discovery of prompt or precursor optical transients fully utilizing the advanced features of wide field as well as high resolution of All-sky Survey High Resolution Air-shower detector ; Ashra. We have installed the detector system, developed data acquisition and slow control monitoring systems, and started wide field observation keeping persistent stability at the observatory on Mauna Loa on the Hawaii Island. We have accumulated 2774 hours of observation time in 17 months. The good weather rate and operation efficiency achieved 90% and 99% respectively. We have already succeeded in searches for optical transients associated with the GRBs which Swift or Fermi triggered.