TITLE: GCN CIRCULAR NUMBER: 13876 SUBJECT: GRB 121017A: BOOTES-2/TELMA observations DATE: 12/10/17 20:34:07 GMT FROM: Alberto Castro-Tirado at Inst.de Astro. de Andalucia GRB 121017A: BOOTES-2/TELMA observations M. Jelínek, A. J. Castro-Tirado, J. Gorosabel (IAA-CSIC Granada), S. Guziy (Nikolaev Univ.), O. Rabaza (Univ. de Granada), on behalf of a larger collaboration, report: “Following the detection of GRB 121017A by Swift (Grupe et al. GCN Circ. 13875) the 0.6m TELMA robotic telescope (+ COLORES) in Málaga (Spain) started to take images (unfiltered) about 3 min postburst (19:26:10 UT), following the initial BAT position. There is no optical counterpart within the Swift/X-ray error box down to R = 18.5 for a 153s combined exposure (5 min post burst). Further exposures in i’-band (22:05 UT, 1200s on the aggregate) set a limit of 19.5 (35 min post burst). We note the considerable extinction (A_v = 1.4) towards this direction 6 deg below the Galactic Plane. Observations are ongoing.” [GCN OPS NOTE(17oct12): Per author's request, OR was added to the author list.]