TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4929 SUBJECT: GRB060218, optical observations DATE: 06/03/27 16:57:54 GMT FROM: Adalberto Piccioni at Astronomy, Bologna U. F. Terra, (Second University of Roma "Tor Vergata"), D. Nanni (INAF/OAR and Second University of Roma "Tor Vergata"), G. Greco, C. Bartolini, A. Guarnieri, A. Piccioni (Bologna University), R. Gualandi, A. De Blasi (INAF Bologna) and G. Pizzichini (INAF/IASF Bologna) report: We observed the OT of GRB 060218/SN 2006aj (Cusumano et al. GCN 4775) in the V and R bands with the 152 cm Loiano telescope equipped with the BFOSC camera system. Observations were carried out on 2006 Mar 7 and 11 under poor observing conditions (seeing=2.7-3.2 arcsec). Using the comparison stars reported by Hicken et al. (GCN 4898), we find the following magnitudes, in agreement with those given by other authors, e.g. Sollerman et al., astro-ph/0603495 and Pian et al., astro-ph/0603530: Mean UT.........filter.....Exptime(s)....... magnitude Mar 07.7506 ......Rc...........300..........17.31+/-0.06 Mar 07.7633.......Rc......... 1200..........17.36+/-0.03 Mar 07.7779.......V...........1200..........17.76+/-0.04 Mar 11.7865.......V............300..........18.15+/-0.08 Mar 11.7962.......V...........1200..........18.11+/-0.06 Mar 11.8123.......Rc..........1200..........17.63+/-0.04 Mar 11.8302.......Rc..........1200..........17.60+/-0.04 One of our images is posted in our public directory from where it can be retrieved by sftp using: hostname: ermione.bo.astro.it username: publicGRB password: GRB_bo.