TITLE: GCN CIRCULAR NUMBER: 16149 SUBJECT: GRB 140419A, LOAO R-band observations DATE: 14/04/23 12:04:51 GMT FROM: Changsu Choi at Seoul Nat U Changsu Choi, Myungshin Im (CEOU/SNU), Hyun-Il Sung (KASI), and Yuji Urata (NCU), on behalf of EAFON We observed the field of GRB 140419A Swift GRB 140419A (Marshall et al., GCN 16118) in R-band using the 1-m telescope at Mt. Lemmon Optical Observatory (LOAO) in Arizona, US We obtained R-band images at two epochs on Apr. 19 and on Apr. 21. We marginally identify the afterglow in a stacked image for each night. The photometry is based on R1-mag of USNO-B1 stars in the observed field. Details of Photometry are below: date UT(mid time) Filter mag 2014/04/19 07:30:51 R 18.64 +/-0.29 2014/04/21 03:39:38 R 21.43 +/-0.27 We thank the LOAO operator, Jae-Hyuk Yoon for performing the observation.