TITLE: GCN CIRCULAR NUMBER: 6857 SUBJECT: GRB071008: IAC80 observation DATE: 07/10/09 17:15:01 GMT FROM: Martin Jelinek at Inst.Astrophys.Andalucia,Granada Martin Jelinek, Alberto J. Castro-Tirado, Javier Gorosabel (IAA-CSIC Granada) and R. Piontek (AIP Potsdam) report on behalf of larger collaboration: We observed the Swift-BAT errorbox of a GRB 071008 (trigger=293587, Moretti et al., GCN 6856), with an IAC 80cm telescope at La Palma starting at 05:43 UT (7.8h after the GRB). Our 3 x 180s combined R-band image has a limiting magnitude of R < 21.5 and does not show any new source in comparison to a DSS-Red, implying a DSS-equivalent limit to the afterglow detection.