TITLE: GCN CIRCULAR NUMBER: 9213 SUBJECT: GRB 090423: Correction to NIR photometry DATE: 09/04/23 20:36:32 GMT FROM: Antonino Cucchiara at PSU A. Cucchiara, D. B. Fox (PSU), and E. Berger (Harvard) report: "Further analysis of our Gemini+NIRI H-band imaging (Cucchiara, Fox & Berger, GCN 9209) has led to a significant correction in the H-band magnitudes for the afterglow/host (Tanvir et al., GCN 9202) of GRB 090423 (Kimm et al., GCN 9198). Our revised magnitudes for this object are: J mag: 19.29 +- 0.07 H mag: 18.57 +- 0.07 The revision to the H-band magnitude, in addition to the absence of any detection in our Y-band images, suggests a break in the spectrum below or within the J-band and above the Y-band, yielding, e.g., 7<~z<~9 in a Lyman-alpha interpretation. Further analysis is in progress and additional observations are planned. We apologize for any inconvenience."