TITLE: GCN CIRCULAR NUMBER: 24903 SUBJECT: GRB 190627A: Optical imaging by D50 from Ondrejov DATE: 19/06/28 21:19:49 GMT FROM: Martin Jelinek at Astro.Inst-AVCR,Ondrejov Martin Jelinek and Jan Strobl (ASU CAS Ondrejov, CZ) report: We observed GRB 190627A (Sonbas et al. GCNC 24888) with the 50 cm robotic telescope (D50) of Ondrejov observatory in the Czech Republic, obtaining a series of 120s images starting at 20:35UT, i.e. 33.3h post trigger. We can detect the optical afterglow (Siegel & Sonbas, GCNC 24889; Leonini et al., GCNC 24893 and others), providing the preliminary magnitude R=19.8, in a good agreement with extrapolation of the power-law decay slope we observed the last night.