GCN Circular 33735
M. Jelinek, J. Strobl, R. Hudec, C. Polasek (ASU CAS Ondrejov) report: We observed the position of the Swift-detected GRB 220506C (Tohuvavohu et al. GCNC 33731) with the D50 telescope of the Astronomical Institute Ondrejov, near Prague, Czech Republic. Our observation started at 19:58 UT, i.e. 2.8 h after the initial trigger and was performed with an SDSS i' filter. We confirm the presence of an object not present in the SDSS survey reported by Pankov et al. (GCNC 33734) in a combined image with exp. mean time ~4.0 h after trigger (exposed 19:58--22:35UT). The AB magnitude of the object in this frame is i' = 20.54 +/- 0.11.