TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5333 SUBJECT: GRB 060717 optical upper limit DATE: 06/07/17 19:36:43 GMT FROM: Alexander Stefanescu at MPE A. Stefanescu, G. Kanbach, S. Duscha, F. Schrey, M. Muehlegger, N.Prymak, H. Steinle (MPE Garching) of the OPTIMA-Burst team report from the 1.3m Skinakas Observatory(University of Crete, Heraklion, Greece): We observed the position of the refined XRT errorcircle (GCN 5331, Capalbi et al.) on 2006-07-17 at 18:55 UT (9:48h post burst). We do not detect a counterpart candidate in our 3x600s white light exposures brighter than 21mag.