TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3498 SUBJECT: GRB050528: BOOTES optical candidate DATE: 05/05/28 13:53:50 GMT FROM: Martin Jelinek at Inst.Astrophys.Andalucia,Granada Martin Jelinek, Alberto J. Castro-Tirado, Antonio de Ugarte Postigo, Stanislav Vitek, Sergey Guziy (IAA CSIC Granada, Spain), Petr Kubanek, Rene Hudec, Martin Nekola, (ASU AV CR Ondrejov, Czech Republic) Petr Pata, Martin Bernas (CVUT Praha, Czech Republic), and Tomas de J. Mateo Sanguino (Univ. Huelva, Spain) report Robotic telescope BOOTES-1B located at CEDEA in El Arenosillo, Suthern Spain, has observed the error box of GRB050528 starting 71s after the GRB trigger. We see a bright variable object at 23:34:42.93 +45:56:14.4 Further analysis is in progress.