TITLE: GCN CIRCULAR NUMBER: 30852 SUBJECT: GRB 210919A: NOT upper limits DATE: 21/09/19 12:24:18 GMT FROM: Daniel Perley at Liverpool JMU <d.a.perley@ljmu.ac.uk> D. A. Perley (LJMU), Z. P. Zhu (NAOC, HUST), D. Xu, S.Y. Fu (NAOC), D. B. Malesani (DTU Space), and A. Avramova-Boncheva (NOT) report: We observed the field of GRB210919A (Tohuvavohu et al. GCN 30846) using the Nordic Optical Telescope (NOT) equipped with the ALFOSC camera. We obtained 3x300s frames in the Sloan r-band filter and 5x240s in the i-band filter. Observations were carried out on 2021-09-19 between 03:29 and 04:08 UT. No source is detected inside the enhanced XRT error circle (Goad et al., GCN 30850), to 3-sigma limits of: r>23.4 mag (at t=3.15 hours post-trigger) and i>23.9 (at t=3.47 hours post-trigger). DisclaimerNone