GCN Circular 16315
D. Kawamura, T. Sakamoto, I. Takahashi, A. Yoshida (AGU) We observed the field of GRB 140521A detected by Swift (trigger #599546; Troja et al., GCN Circ. 16311) with the 12-inch AGU Robotic Optical Monitor for Astrophysical object - Narrow (AROMA-N) located at the Sagamihara campus of Aoyama Gakuin University. 15 images of 60 sec exposures were taken in the R filter starting from May 21 17:36:17 (UT) about 119 sec after the trigger (104 sec after the BAT position notice) and stopped on May 21 18:03:04 (UT). We do not detect the optical afterglow both in the individual images and the stacked image inside the BAT flight position (Troja, et al., GCN #16311). The estimated five sigma upper limit of the combined image (total exposure of 900 sec) is ~17.2 mag using the USNO-B1 catalog.