TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3023 SUBJECT: GRB 050215b, BOOTES-1B optical limit DATE: 05/02/15 04:23:01 GMT FROM: Martin Jelinek at Inst.Astrophys.Andalucia,Granada Martin Jelinek, Javier Gorosabel, Alberto J. Castro-Tirado, Antonio de Ugarte Postigo, (IAA CSIC, Granada), Petr Kubanek, Rene Hudec (ASU AV CR Ondrejov) and Stanislav Vitek (FEL CVUT Praha). report: We have imaged the error box of Swift's GRB 050215b [trigger #106107], with the BOOTES-1B facility in southern Spain. Comparison with the GSC-2 catalogue does not reveal any new source. We report the following 3-sigma magnitude limits 25.6 minutes (mean obs. time) after trigger: V > 16.5 I > 15.0 on our 600s exposures. [GCN OPS NOTE (15feb05): Per author's request, the 050215c was changed to 050215b (since the HETE trigger earlier turned out to not be a real GRB.)]