TITLE: GCN CIRCULAR NUMBER: 16150 SUBJECT: GRB 140423A: Gemini-N redshift DATE: 14/04/23 12:14:10 GMT FROM: Nial Tanvir at U.Leicester N. R. Tanvir (U. Leicester), A. J. Levan (U. Warwick), K. Wiersema (U. Leicester), A. Petric, K. Chiboucas, J. Miller (Gemini) report: We observed the afterglow of GRB 140423A (Sonbas et al. GCN 16142; Elenin et al. GCN 16143; Kaur et al. GCN 16144; Ferrante et al. GCN 16145; Chester et al. GCN 16147) with the GMOS-N spectrograph on Gemini-N. Observations began at 10:25 UT, approximately 1.9 hr post burst. The spectra show absorption lines due to Ly-alpha, SiII (1251/1254), SiII* (1265), OI (1302), SiII (1304), CII (1334), SiIV (1394/1403), SiII (1527), CIV (1548/1551) at a common redshift of z=3.26, which we infer is the redshift of the GRB.