TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3354 SUBJECT: GRB 050504 : R band observation at Lulin observatory DATE: 05/05/04 19:18:08 GMT FROM: Kuiyun Huang at IANCU GRB 050504 : R band observation at Lulin observatory K. Sanchawala, Y.L. Wu, K.Y. Huang, W.H. Ip(NCU), Y. Urata, (RIKEN), Y. Qiu (BAO), Y.Q. Lou (THCA), on behalf of EAFON report: " We have imaged the error region of GRB 050504(GCN 3348) using 1-m telescope at Lulin Observatory, Taiwan. The R band observations ( 60s x 15 frames) started from 13.27 UT to 13.55 UT (~ 5.26 hours to 5.54 hours after the burst). The limiting magnitude of R band co-added image is R ~ 21 compared with USNOB1.0 stars. No new source was found down to the limiting magnitude. This message may be cited."