TITLE: GCN CIRCULAR NUMBER: 23893 SUBJECT: GRB 190211A: DOAO optical observation DATE: 19/02/12 14:47:34 GMT FROM: Gregory SungHak Paek at SNU Gregory S.H. Paek, Myungshin Im (CEOU/SNU), Taewoo Kim, and Wonseok Kang (DOAO) on behalf of a larger collaboration We observed the afterglow of GRB 190211A(Marshall et al., GCN 23883; Xu et al., GCN 23884; Lipunov et al., GCN 23885; Hu et al., GCN 23886; Stamatikos et al., GCN 23887; Evans et al., GCN 23888) with the 1.0-m telescope at the Deokheung Optical Astronomy Observatory. The observation started at 2019-02-11 18:28 UT or about 1.5 hours after the initial alert. The afterglow is detected in R bands, and preliminary magnitudes are derived, using nearby Pan-STARRS stars as photometry references. Filter Date UT-start exptime[sec] AB_mag R 2019-02-11 18:28:45 300*3 21.27 +/- 0.2