TITLE: GCN CIRCULAR NUMBER: 9673 SUBJECT: GRB090715B: WHT redshift DATE: 09/07/16 05:19:03 GMT FROM: Klaas Wiersema at U of Leicester K. Wiersema (Leicester), A. Levan (Warwick), A. Kamble (Amsterdam), N. Tanvir (Leicester) and D. Malesani (DARK/NBI) report on behalf of a larger collaboration: We observed the afterglow of GRB090715B (Vetere et al, GCN 9668; Smith et al GCN9 670) with the William Herschel Telescope, using the ISIS spectrograph. Exposure times were 3 x 900 seconds with the R300B and R316R grisms in the blue and red arm respectively, starting at 23:46 UT. We detect a multitude of lines, including Lyman alpha, Lyman beta, SiII and SII at redshift z=3.00. We thank T. Ottosen for acquiring this dataset.