TITLE: GCN CIRCULAR NUMBER: 12350 SUBJECT: GRB 110915B: Afterglow candidate from OSN DATE: 11/09/16 13:22:14 GMT FROM: Antonio Deugarte at IAA-CSIC A. de Ugarte Postigo (DARK/NBI), J. C. Tello, V. Casanova, A. J. Castro-Tirado, R. Sanchez-Ramirez, J. Gorosabel, S. Guziy (IAA-CSIC) D. Malesani (DARK/NBI) report on behalf of a larger collaboration: We have observed the field of the AGILE GRB 110915B (Del Monte et al. GCNC 12341) using the 1.5m OSN telescope at Sierra Nevada Observatory (Granada, Spain). The observation consisted of 46 x 120s exposures in R-band. In the combined exposure we detect an uncatalogued source inside the error box of the XRT afterglow candidate (D'Avanzo et al. GCNC 12348) at the following coordinates (J2000, +/- 0.5"): R.A.: 05:10:13.14 Dec.: +01:55:59.1 The preliminary magnitude of the object at an average epoch of Sep. 16.166 UT (9.59 hr after the burst onset) is R = 22.8+/-0.30, as compared to the USNO-B1.0 star at coordinates 05:10:09.720, +01:56:40.12, for which we assume R = 17.61. Further analysis is ongoing.