TITLE: GCN CIRCULAR NUMBER: 7819 SUBJECT: GRB080604: HET redshift retraction DATE: 08/06/04 20:56:18 GMT FROM: Antonino Cucchiara at PSU A. Cucchiara and D. B. Fox (Penn State) report: Based on updated calibration files we re-analyzed the GRB080604 spectrum taken at HET (GCN 7805). The features reported in the previous GCN are no longer significant at a 3-sigma confidence level. Furthermore, only an upper limit of z < 2.8 can be derived from our dataset. Our revised results are consistent with the results from Gemini-North spectroscopy (Wiersama et al., GCN 7818). The low signal to noise of our spectrum does not permit detection of the absorption features associated with the z=1.416 system seen in those data.