TITLE: GCN CIRCULAR NUMBER: 31321 SUBJECT: GRB 211227A: LCO Optical Observations DATE: 21/12/28 02:51:59 GMT FROM: Robert Strausbaugh at U. of the Virgin Islands R. Strausbaugh (U. of the Virgin Islands), A. Cucchiara (College of Marin) report on behalf of a larger collaboration: We observed Swift GRB 211227A (Beardmore, et al., GCN 31316) with the LCO 1-m Sinistro instrument at the Teide, Tenerife site, on December 28, from 00:39 to 01:11 UT (corresponding to 1.12 to 1.48 hours from the GRB trigger time) with the Bessel R and I filters. We performed a series of 4x240s exposures in R and I bands. We detect no sources within the Swift XRT detection region (Beardmore, et al., GCN 31316) in either band. The following upper limits are calculated using the USNO-B.1 catalog as reference: R>22.81 I>22.42 We do note the presence of a faint uncatalogued source just outside the XRT region at RA, DEC = (132.1449185, -2.7343489) at the following magnitudes, calculated with respect to the USNO-B.1 catalog: R=21.79+/-0.20 I=22.13+/-0.24 We recommend continued monitoring of this source to determine if it is fading. These magnitudes are not corrected for galactic extinction. R.S. is funded by NSF AST grant #1831682