GCN Circular 5942
Klotz, A. (CESR-OMP), Boer M. (OHP), Atteia J.L. (LATT-OMP) report: We imaged the field of GRB 061217 detected by SWIFT (trigger 251634) with the TAROT robotic telescope (D=25cm) located at the Calern observatory, France. The observations started 20.2s after the GRB trigger (8.1s after the notice). The elevation of the field increased from from 24 degrees above horizon and weather conditions were excellent. The date of trigger : t0 = 2006-12-17T03:40:07.968 We examined the XRT position provided by Evans et al. 2006 (GCN Circ. 5932). The first image is trailed with a duration of 60.0s (see the description in Klotz et al., 2006, A&A 451, L39). We do not detect any OT with a limiting magnitude of: t0+20.2s to t0+80.2s : R > 16.5 The second image is 30.0s exposure in tracking mode: t0+87.1s to t0+117.1s : R > 18.1 We co-added a series of exposures: t0+87.1s to t0+370.6s : R > 19.2 Magnitudes were estimated with the nearby USNO-B1 stars and are not corrected for galactic dust extinction. We have also images from TAROT La Silla but they were obtained at lower elevation. So limiting magnitudes are less high. N.B. Galactic coordinates are lon=266.5898 lat=+32.4491 and the galactic extinction in R band is 0.1 magnitudes estimated from D. Schlegel et al. 1998ApJ...500..525S. This message may be cited.