TITLE: GCN CIRCULAR NUMBER: 23844 SUBJECT: GRB 190202A: SAO RAS optical observations DATE: 19/02/03 14:23:55 GMT FROM: Moskvitin Alexander at SAO RAS A. S. Moskvitin and O. I. Spiridonova (SAO RAS) report on behalf of larger collaboration. We observed the field of the GRB 190202A (Lien et al., GCNC #23830) with the Zeiss-1000 telescope of SAO RAS (+ CCD photometer) on February, 3, 2:21:17--3:13:27 UT (mid.date 2:47:22). The observations were carried out in Rc band. We detected the OT (Novichonok et al., GCNC #23831; Steeghs et al., GCNC #23833; Paul Kuin & A. Y. Lien, GCNC #23834; Cucchiara, GCNC #23839; Paek et al., GCNC #23841; Malesani et al., GCNC #23842; Belkin et al., 23843) in the stacked 9 x 300 sec image. Preliminary brightness of OT is R = 21.45 +/- 0.15 (T-T0 = 1.047 d). The calibrations is based on nearby SDSS stars, magnitudes converted with the Lupton 2005 equations.