Observing prompt optical emission from Gamma Ray Bursts (GRB) sources is crucial to understand the processes involved. After brief review of the status of this domain we present ``Pi of the Sky'' project proposing new aproach to the problem. Algorithm for detection of optical flashes is described and the first results from the prototype apparatus are given.

PACS numbers: 98.70.Rz, 95.75.Rs, 95.55.Aq