TITLE: GCN CIRCULAR NUMBER: 10465 SUBJECT: GRB 100302A: Gemini-N OT confirmation DATE: 10/03/03 15:22:47 GMT FROM: Antonino Cucchiara at PSU A. Cucchiara, D. B. Fox (PSU) report on behalf of a larger collaboration: "On March 3.40 UT we observed the field of GRB 100302A (Cummings et al., GCN 10458) with the Gemini-N telescope and the GMOS spectrograph. In our 300s i'-band acquisition image we clearly identify a source inside the XRT refined error circle (Goad et al. 10460). Using 3 USNO-B1 stars we calibrated our photometry and obtained i' = 22.01 +- 0.05 mag This value is significantly below the detection reported by Huang et al. (GCN 10461) confirming that this is the afterglow of GRB 100302A. We also performed a single 1200s spectroscopic observation. No absorption or emission features have been detected over the 4000-9000A coverage of our spectrum. We thank the Gemini staff for performing this observation, in particular Andrew Stephens."