TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4029 SUBJECT: GRB 050922C: Refined redshift DATE: 05/09/23 15:39:42 GMT FROM: Pall Jakobsson at Niels Bohr Inst Páll Jakobsson, Johan P. U. Fynbo, (DARK, NBI), Danka Paraficz, John Telting (NOT, La Palma), Brian L. Jensen, Jens Hjorth and José María Castro Cerón (DARK, NBI) report: Using new wavelength calibration files, we have refined the GRB 050922C redshift obtained at the NOT (GCN 4017). Based on the detection of Lyman-alpha, OI+SiII, CII, SiIV, FeII, AlII, SiII* and SiII in absorption, we measure a redshift of z = 2.198+-0.001. There is additional strong absorption, possibly corresponding to Lyman-alpha at z = 2.07.