“π of the Sky” – automated search for fast optical transients over the whole sky

Institute of Electronic Systems, Warsaw University of Technology, Nowowiejska 15/19, 00-665 Warsaw, Poland Institute of Experimental Physics, Faculty of Physics, Warsaw University, Hoza 69, 00-681 Warsaw, Poland Center for Theoretical Physics PAN, Al. Lotnikow 32/46, 00-668 Warsaw, Poland Astronomical Observatory, Warsaw University, Al. Ujazdowskie 4, 00-478 Warsaw, Poland Soltan Institute for Nuclear Studies, Hoza 69, 00-681 Warsaw, Poland