[vsnet-grb-info 13081] GRB 130420A: GMG optical observation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  14418
SUBJECT: GRB 130420A: GMG optical observation
DATE:    13/04/20 18:49:21 GMT
FROM:    Xiao-hong Zhao at Yunnan Obs  <zhaoxiaohong78 at gmail.com>

X.-H. Zhao (YNAO and PSU), J. Mao (RIKEN and YNAO), J.-M. Bai 
(YNAO) report on behalf of a larger collaboration:

We observed the field of GRB 130420A (Page et al., GCN 14406) with 2.4m Gao-Mei-Gu (GMG) telescope. Observations
started at 13:36:00 UT on 2013-04-20 (i.e., 6.13 hrs after the burst, ~2 hrs later than the observation of Xu et al., GCN 14413) and 3x600s R-band and 1x600s I-band images were obtained. The optical counterpart of this burst was detected in both bands. The mag are R~19.4 and I~20.2 calibrated with USNO B1 stars. 
   
We thank the GMG staff, especially Yu-Xin Xin, Gui-Hua He and Jian-Duo He for
performing these observations.