TITLE: GCN CIRCULAR NUMBER: 12368 SUBJECT: GRB 110918A: Gemini-N redshift DATE: 11/09/20 15:30:29 GMT FROM: Nial Tanvir at U.Leicester A.J. Levan (U. Warwick), N.R. Tanvir, K. Wiersema (U. Leicester), E. Berger (Harvard), D. Fox (Penn State) report on behalf of a larger collaboration: We observed the candidate optical afterglow of GRB 110918A reported by Tanvir et al. (GCN12365) with the GMOS-N spectrograph on Gemini-N, Mauna Kea. ��Observations began at 20-Sep-2011 12:51 UT. ��The trace is well detected and consistent with being a power-law continuum, confirming that this source is very likely the afterglow of the burst detected by the IPN (Hurley et al. GCN12357, see also Cenko et al. GCN12367). ��We identify absorption features of MgII (2796A/2804A), MgI (2853A) and CaII (3935A/3970A) at a common redshift of z=0.982 (based on a provisional wavelength calibration). We thank the Gemini staff, particularly Jen Holt, for obtaining these observations.