TITLE: GCN CIRCULAR NUMBER: 14087 SUBJECT: Subject : GRB 121209A: LOAO Observation DATE: 12/12/15 14:17:50 GMT FROM: Seong-Kook Lee at CEOU,SNU,Korea Seong-Kook Lee, Myungshin Im (SNU), and Y. Urata (NCU) report: We observed the location of GRB 121209A with the ARC Camera mounted on the 1.0m Telescope at Mt. Lemmon Optical Astronomy Observatory (LOAO) on 2012 Dec 10, 09:06 UT. We obtained a series of 300 seconds exposure images in I-band and Z-band under 4" seeing. We do not detect any source in both bands. Calibrated to SDSS stars, we derive 3-sigma detection limit (in AB system) in each band, I > 20.9 Z > 19.6 We thank KASI staff for their support.