TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5417 SUBJECT: GRB060807: optical upper limit in white light DATE: 06/08/07 20:29:05 GMT FROM: Sven Duscha at MPE S. Duscha M. Muehlegger A. Stefanescu G. Kanbach,N. Prymak, F. Schrey 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 XRT errorcircle of GRB 060807 (trigger #223217 De Pasquale et al. GCN Circ. 5409) on 2006 Aug 07 19:25 UT (mid-exposure; about 5 hours post burst): In a 20 min white light exposure we do not detect a counterpart candidate brighter than mag 20.