TITLE: GCN CIRCULAR NUMBER: 16163 SUBJECT: GRB 140423A: Kanata/HONIR Optical and NIR Observations DATE: 14/04/24 08:15:36 GMT FROM: Michitoshi Yoshida at HASC,Hiroshima U Hiroshi Akitaya, Yuki Moritani, Takahiro Ui, Yuka Kanda, and Michitoshi Yoshida (Hiroshima Univ.) on behalf of the OISTER collaboration: We observed the field of GRB140423A (Sonbas et al., GCNC 16142) with the optical and near-infrared simultaneous imager HONIR (Sakimoto et al. 2012, Proc.SPIE 8446, 844673) attached to the 1.5-m Kanata Telescope at Higashi-hiroshima Observatory, Japan. We detected the afterglow at R_C and J bands at 2014-04-23 10:46 UT (~2.2 hours after the burst). Photometric results are as follows. MID-UT Total exp[sec] Band Mag Mag_err ---------------------------------------------------------- 2014-04-23 10:46 720 Rc 19.4 0.3 2014-04-23 10:46 792 J 17.3 0.2 ----------------------------------------------------------