PULSED EMISSION OF VERY HIGH ENERGY GAMMA RAYS FROM CRAB PULSAR

We present here the results of observation of very high energy(VHE) gamma-ray emission from Crab Pulsar with the Beijing Atmospheric Cerenkov Telescopes, named ACT2 and ACT3, during the 1995－1996 season. The data are based on 168 h (ACT2) and 125 h (ACT3) of exposure over the period of observation in tracking mode. After converting the event time to the solar barycentre, the data have been searched for evidence of pulsed emission at 33 ms period of Crab Pulsar. We found no steady emission of VHE Gamma-ray with 33 ms period at the time scale of month or nights. But there are two evidences of sporadic emission over an hour duration with the same period as the one at radio wave band.