TITLE: GCN CIRCULAR NUMBER: 15593 SUBJECT: INTEGRAL Weak trigger #6403: AROMA-N Optical Observation DATE: 13/12/12 13:48:59 GMT FROM: Takanori Sakamoto at AGU D. Kawamura, T. Sakamoto, I. Takahashi, S. Sugai, A. Yoshida (AGU) We observed the field of INTEGRAL Weak trigger #6403 with the 12-inch AGU Robotic Optical Monitor for Astrophysical object - Narrow (AROMA-N) located at the Sagamihara campus of Aoyama Gakuin University. 60 images of 10 sec exposures and 30 images of 60 sec exposures were taken in the R filter starting from December 13 10:45:22 (UT) about 109 sec after the trigger (103 sec after the INTEGRAL weak trigger notice) and stopped on December 13 11:40:24 (UT). We do not detect the optical afterglow both in the individual images and the stacked image, which combined 89 good quality images, inside the INTEGRAL weak position. The estimated five sigma upper limit of the combined image (total exposure of 2390 sec) is ~17.0 mag using the USNO-B1 catalog.