TITLE: GCN CIRCULAR NUMBER: 23890 SUBJECT: GRB 190211A: NOT optical observations DATE: 19/02/12 09:23:10 GMT FROM: Dong Xu at NAOC/CAS K.E. Heintz (Univ. of Iceland), D. Xu (NAOC), D.B. Malesani (DAWN/NBI and DARK/NBI), S. Moran (NOT), report on behalf of a larger collaboration: We observed the field of GRB 190211A (Marshall et al., GCN 23883) using the 2.56-m Nordic Optical Telescope (NOT) equipped with the ALFOSC camera. We obtained 3x200 s SDSS r-band and 3x300 s SDSS z-band frames, starting at 02:23:58 UT on 2019-02-12, i.e., 9.487 hr after the BAT trigger. The previously reported optical afterglow (e.g., Xu et al., GCN 23884; Hu et al., GCN 23886) is clearly detected in our stacked images. The afterglow faded to m(r)=22.7 ¡À 0.1 mag at 9.578 hr post-burst and m(z) = 22.0 ¡À 0.2 mag at 9.815 hr post-burst, calibrated with nearby SDSS stars.