TITLE:   GCN CIRCULAR
NUMBER:  31232
SUBJECT: GRB 211211A: GMG upper limit
DATE:    21/12/15 02:00:51 GMT
FROM:    Jirong Mao at Yunnan Obs  <jirongmao_obs@ynao.ac.cn>

J. Mao, Y.-X. Xin, and J.-M. Bai (YNAO) report:


We observed the field of GRB 211211A (D'Ai et al. GCN 31202) by the GMG telescope in Yunnan observatories.

The observation began from UT 22:41:02 Dec 12, 2021, about 33.5 hours from the trigger. We could not observe

the optical afterglow down to a magnitude limit of r~22.0.