GCN Circular 33662
R. Strausbaugh (University of Minnesota), A. Cucchiara (NASA) report on behalf of a larger collaboration: We observed the GRB 230420A (Klingler et al., GCN 33658) field with the LCOGT 1-meter Sinistro instrument at the Teide Observatory, Tenerife site, on April 20, from 20:28 to 20:55 UT (corresponding to 11.15 to 11.72 hours from the GRB trigger time) with the SDSS r and i filters. We performed a series of 3x300s exposures in each band. We do not detect a source within the Swift-XRT enhanced error region (Osborne et al., GCN 33661) in either band. The following upper limits are calculated using the PanSTARRS catalog as reference: r > 22.3 i > 21.8 These magnitudes are not corrected for galactic extinction.