[vsnet-grb-info 13086] GRB130420B: GMG optical upper limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  14423
SUBJECT: GRB130420B: GMG optical upper limit
DATE:    13/04/20 20:23:53 GMT
FROM:    Xiao-hong Zhao at Yunnan Obs  <zhaoxiaohong78 at gmail.com>

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 130420B (Page et al., GCN 14421; Oates et al., GCN 14411) with 2.4m Gao-Mei-Gu (GMG) telescope. Observations
started at 13:21:14 UT on 2013-04-20 (i.e., 0.4 hrs after the burst). The observations lasted for ~10min. The afterglow was not found at 
the XRT position, down to a upper limit of R>22.6. 
   
We thank the GMG staff, especially Yu-Xin Xin, Gui-Hua He and Jian-Duo He for
performing these observations.