TITLE: GCN CIRCULAR NUMBER: 26538 SUBJECT: GRB 191221B: Swift/UVOT redshift DATE: 19/12/22 01:33:28 GMT FROM: Paul Kuin at MSSL N. P. M. Kuin (UCL-MSSL) reports on behalf of the Swift/UVOT team: The Swift/UVOT obtained a 49s grism spectrum of GRB 191221B 242 s after the BAT trigger (Laha et al., GCN Circ. 26534). The spectrum shows a clear break at 2008 Angstrom, suggesting a redshift of z=1.19. At that redshift, the line of He II 1640A is well defined and N II 2143A is present, as well as possibly N V at 1243 A.