TITLE: GCN CIRCULAR NUMBER: 14567 SUBJECT: GRB 130505A - Gemini-N/GMOS redshift determination DATE: 13/05/05 10:30:19 GMT FROM: Nial Tanvir at U.Leicester N. R. Tanvir (U. Leicester), A. J. Levan (U. Warwick), T. Matulonis and A. B. Smith (Gemini) report on behalf of a larger collaboration: We observed the afterglow of GRB 130505A (Cannizzo et al. GCN 14563) with the GMOS-N spectrograph on Gemini-N, beginning approximately 60 min after the BAT trigger. In our provisional reduction we detect numerous absorption lines, including Lyman alpha, SiII/SiII*1260, SiII*1264, OI1302, SiII/OI*1304, SiII*1309, CII/CII* 1334/1335, SiIV1394/1403, SiII 1527, SiII* 1533, CIV 1548/1551, FeII 1608, AlII 1671 and AlIII 1855/1863 at a common redshift of z=2.27. The presence of fine structure lines, in particular, confirms this to be the redshift of this burst.