TITLE: GCN CIRCULAR NUMBER: 17648 SUBJECT: GRB 150323C: Nishi-Harima NIR Observations DATE: 15/03/26 19:33:31 GMT FROM: Taketoshi Yoshii at Tokyo Tech S. Honda. J. Takahashi, Y. Takagi, K. Morihana, Y. Itoh (Univ. of Hyogo), and Y. Saito (Tokyo Tech) report on behalf of Nayuta team and OISTER collaboration: We observed the field of GRB 150323C (Amaral-Rogers et al., GCN 17621) with Nishiharima Infrared Camera (NIC) attached to the Nayuta 2-m telescope at the Nishi-Harima Astronomical Observatory. The observations were started at 17:30 UT on 2015-03-23. We detected the near-infrared afterglow in J, H and Ks bands. Photometric results of our observations are shown below. We used 2MASS 12502614+5011480, 12502605+5011289, 12503202+5010217, and 12503649+5012012 as reference stars for photometry. # MID-UT Tmid-T0 T-EXP J_mag H_mag Ks_mag -------------------------------------------------------------------------------- 17:33:16 28 1200 18.22 +/- 0.10 17.25 +/- 0.10 16.44 +/- 0.13 17:59:27 54 1200 18.68 +/- 0.11 17.59 +/- 0.11 16.94 +/- 0.14 18:25:32 80 1200 19.40 +/- 0.20 17.77 +/- 0.13 17.23 +/- 0.14 --------------------------------------------------------------------------------- Tmid-T0: Elapsed time after the burst (minutes) T-EXP: Total Exposure time (seconds)