GRB 090726: D50 optical observations. Polasek, C. ; Strobl, J. ; Jelinek, M. ; Kubanek, P. ; Kocka, M. ; Nekola, M. ; Blazek, M. ; Hudec, R. Abstract Publication: GRB Coordinates Network Pub Date: 2009 Bibcode: 2009GCN..9714....1P