GRB050803: CrAO optical observations, no OT candidate. Pavlenko, E. ; Shlyapnikov, A. ; Efimov, Y. ; Baklanov, A. ; Rumyantsev, V. ; Pozanenko, A. ; Sharapov, D. ; Ibrahimov, M. Abstract Publication: GRB Coordinates Network Pub Date: 2005 Bibcode: 2005GCN..3783....1P