TITLE: GCN CIRCULAR NUMBER: 15485 SUBJECT: GRB 131108A: ISON Blagoveshensk upper limit DATE: 13/11/14 06:21:44 GMT FROM: Alina Volnova at SAI MSU A. Volnova (IKI), D. Varda (ISON), E. Sinyakov (ISON), I. Molotov (KIAM), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration: We observed the field of GRB 131108A (Racusin et al., GCN 15464, Hurley et al., GCN 15466) with ORI-25 telescope of ISON-Blagoveshensk observatory starting Nov., 9 (UT) 16:40:45. We took several unfiltered images with exposures of 30 seconds. In the combined images in the enhanced XRT circle (Stroth & Kennea, GCN 15474) we do not detect the OT reported by Gorosabel et al. (GCN 15469). The details of the photometry are the following: UT start t-T0 Filter Exp. OT UL (3sigma) (mid, days) (s) 16:40:45 0.85072 None 95x30 n/d 17.1 The photometry is based on a nearby bright SDSS star, R (gri -> R transformations by Lupton 2005): SDSS id R J102613.43+094109.5 13.318 +/- 0.013