TITLE: GCN CIRCULAR NUMBER: 27445 SUBJECT: GRB 200324A: AROMA-N Optical Observation DATE: 20/03/26 06:44:11 GMT FROM: Takanori Sakamoto at AGU M. Nakamura, T. Sakamoto (AGU) We observed the field of GRB 200324A detected by Swift (Dichiara et al., GCN Circ. 27428) with the 14-inch AGU Robotic Optical Monitor for Astrophysical object - Narrow (AROMA-N) located at the Sagamihara campus of Aoyama Gakuin University. 22 images of 60 sec, 120 sec, 180 sec and 300 sec exposures were taken in the R filter starting from March 24 16:42:55 (UT) about 228 seconds after the trigger and stopped on March 24 19:06:11 (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 3240 sec) is ~17.6 mag using the USNO-B1 catalog.