TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4149 SUBJECT: GRB051022: Optical Observations DATE: 05/10/23 08:25:30 GMT FROM: Richard J. Cool at U.of AZ/Steward Obs Richard Cool (Arizona) reports: On 23 October 2005 UT, we observed the XRT error circle or GRB051022 (Racusin et al GCN 4141) with the WIYN 0.9m telescope on Kitt Peak through a Johnson R filter. We observed the field twice for 60 minutes at mean epochs JD 2453666.6068 and 2453666.7148. Near the reported XRT position, we find three sources. An image can be found at http://mizar.as.arizona.edu/~rcool/grb/grb051022.jpg Two of these sources, A (R=20.31) and B (R=21.51) are detected in DSS images, while the third source, C (R=21.21), is not. Photometry is calibrated relative to nearby USNO stars. Our sources A and B are consistent with the positions of sources A and B from Castro-Tirado et al (GCN 4143). Object C, which does not appear in DSS images, lies 7" from the location from the Swift XRT. Source C appears point-like in our images and is located at alpha J2000 = 23:56:04.2 delta J2000 = 19:36:32.3 There is a fainter source to the SW of object B, but at R=22.1, this source is below the detection threshold of the DSS images, and thus it is unclear if the source is transient. None of the objects detected appear to fade between our observational epochs. Of the sources near the XRT position, object C is the most favorable as the afterglow from the GRB due to its absence in the DSS images, but its distance from the XRT localization makes this interpretation suspect. This message may be cited.