TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4558 SUBJECT: GRB 060121: optical observations DATE: 06/01/22 09:03:37 GMT FROM: Grant Williams at Steward Observatory G. G. Williams, E. Olszewski, and P. A. Milne (Steward Observatory) report: We observed the HETE-SXC error region of the short/hard GRB 060121 (Arimoto et al., GCN 4550, Prigozhin et al., GCN 4551, Boer et al., GCN 4552) with the 90prime imager on the Steward Observatory 90-inch Bok telescope at Kitt Peak. We obtained two sets of summed images in Rc, each with a total exposure time of 1800 seconds, beginning at 04:02:45 UT (5.6 hours after the GRB) and at 05:40:29 UT. Visual comparison of these images reveals no significantly variable sources to approximately 1.0 magnitudes deeper than the SDSS r' image (Cool et al., GCN 4554). This message may be cited.