TITLE: GCN CIRCULAR NUMBER: 5405 SUBJECT: GRB 060805: optical upper limit in R DATE: 06/08/05 21:39:23 GMT FROM: Alexander Stefanescu at MPE M. Muehlegger, S. Duscha, A. Stefanescu, G. Kanbach, N. Primak, 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 060805 (trigger #222683, Ziaeepour, et al., GCN Circ. 5398) on 2006 Aug 05, 18:43 UT (mid-exposure; about 14 hours post burst): in a 30 min R-filter exposure we do not detect a counterpart candidate brighter than R=21.5