TITLE: GCN CIRCULAR NUMBER: 22008 SUBJECT: GRB 171013A: TAROT Calern observatory optical observations DATE: 17/10/13 09:35:10 GMT FROM: Alain Klotz at IRAP-CNRS-OMP Klotz A., Noysena.K., Atteia J.L. (CNRS-OMP-IRAP), Boer, M., Eymar, L. (CNRS-ARTEMIS), Gendre B. (UVI - Etelman Obs.) report: We imaged the field of GRB 171013A detected by SWIFT (trigger 778435) with the TAROT robotic telescope (D=25cm) located at the Calern observatory, France. The observations started 33.3s after the GRB trigger (12.8s after the notice). The elevation of the field increased from 50 degrees above horizon and weather conditions were good. 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+33.3s to t0+93.3s : Rlim = 16.8 The second image is 30.0s exposure in tracking mode: t0+106.1s to t0+136.1s : Rlim = 17.8 Magnitudes were estimated with the nearby NOMAD1 stars and are not corrected for galactic dust extinction. N.B. Galactic latitude is +1.2 deg and the galactic extinction in R band is higher than 2 magnitudes from D. Schlegel et al. 1998ApJ...500..525S.