TITLE: GCN CIRCULAR NUMBER: 26801 SUBJECT: GRB 200115A: AROMA-N Optical Observation DATE: 20/01/17 12:46:20 GMT FROM: Takanori Sakamoto at AGU M. Nakamura, T. Sakamoto (AGU) We observed the field of GRB 200115A detected by Swift (Cenko et al., GCN Circ. 26771) with the 14-inch AGU Robotic Optical Monitor for Astrophysical object - Narrow (AROMA-N) located at the Sagamihara campus of Aoyama Gakuin University. 60 images of 60 sec exposures were taken in the R filter starting from January 15 12:14:42 (UT) about 24 minutes after the trigger and stopped on January 15 13:27:55 (UT). We do not detect the optical afterglow both in the individual images and the stacked image. The estimated five sigma upper limit of the combined image (total exposure of 3600 sec) is ~18.1 mag using the USNO-B1 catalog.