TITLE: GCN CIRCULAR NUMBER: 7809 SUBJECT: GRB 080430: optical observations DATE: 08/06/04 15:58:14 GMT FROM: Graziella Pizzichini at IASF/CNR,Bologna F. Terra (Second University of Roma "Tor Vergata"), F. Munz (INAF/IASF Bologna) G. Greco, C. Bartolini, A. Guarnieri,A. Piccioni (Bologna University), D. Nanni (INAF/OAR and Second University of Rome "Tor Vergata"), G. Pizzichini(INAF/IASF Bologna), S. Galleti and S. Bernabei (Bologna Observatory) report: During the night between 08/04/30 and 08/05/01 we observed the OT of GRB080430 (Guidorzi et al., GCN 7647, Klotz, Boer & Atteia, GCN 7646) with the 1.52 cm telescope of the Bologna Observatory in Loiano in good weather conditons, airmass between 1 and 1.6, seeing less than 4". We obtained a total of 14 frames in Rc, V, B and I. Rc magnitudes went from 19.47 +- 0.11 at 2454587.40325 UT to 20.53 +- 0.10 at 2454587.54819 UT. Rc calibration was obtained from the NOMAD catalog. Our images have been posted in our public directory from where they can be retrieved by sftp using hostname: ermione.bo.astro.it username: publicGRB password: GRB_bo directory: /home/publicGRB/GRB080430/