TITLE: GCN CIRCULAR NUMBER: 7536 SUBJECT: GRB 080330: TAROT Calern observatory optical detection DATE: 08/03/30 04:02:13 GMT FROM: Alain Klotz at CESR-CNRS Klotz, A. (CESR-OMP), Boer M. (OHP), Atteia J.L. (LATT-OMP) report: We imaged the field of GRB 080330 detected by SWIFT (trigger 308041) with the TAROT robotic telescope (D=25cm) located at the Calern observatory, France. The observations started 20.4s after the GRB trigger (4.5s after the notice). The elevation of the field decreased from from 26 degrees above horizon and weather conditions were good. We detect a new raising source in the error box given by SWIFT We detected the candidate couterpart in the XRT location at the following position (+/- 1 arcsec): RA(J2000.0) = 11h 17m 04s47 DEC(J2000.0) +30d 37' 26"90 OT was R~16.8 at 300s after GRB. Magnitudes were estimated with the nearby USNO-B1 stars and are not corrected for galactic dust extinction. N.B. Galactic coordinates are lon=197.8461 lat=+69.1207 and the galactic extinction in R band is 0.0 magnitudes estimated from D. Schlegel et al. 1998ApJ...500..525S. This me