TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3017 SUBJECT: GRB050209: REM optical observations DATE: 05/02/09 18:21:58 GMT FROM: Paolo D'Avanzo at INAF-OAB P. D'Avanzo, A. Melandri, S. Covino, E. Palazzi, V. Testa, F. D'Alessio, D. Malesani, L. A. Antonelli, F.M. Zerbi, G. Tosti, A. Monfardini, L. Nicastro, G. Chincarini, M. Rodono', G. Cutispoto, E. Molinari, F. Vitali, on behalf of the REM/ROSS Team report: "We imaged the field of GRB050209 (HETE 11568: Kawai et al, GCN 3013) with the robotic 60cm REM telescope located in La Silla (Chile) starting observations 24 seconds just after received the trigger through GCN Notice. Observations were performed in fully automated mode with the REM Optical Slitless Spectrograph (ROSS) in the V, R and I filters (REM IR camera was in manteinance). Oservation started on 2005 Feb 09.163 UT, approximately 2.4 h after the GRB. The field was imaged in each filter for a total exposure time of 400s, under good seeing conditions. No new sources are detected within the HETE error circle by comparison with the Digitized Sky Survey, down to a limiting magnitude V=19.1, R=19.1, I=18.5 (5-sigma confidence). This message is citeable."