[vsnet-grb-info 27172] GRB 210104A: GMG observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  29275
SUBJECT: GRB 210104A: GMG observations
DATE:    21/01/07 08:57:00 GMT
FROM:    Jirong Mao at Yunnan Obs  <jirongmao_obs at ynao.ac.cn>

J. Mao, X. Ding, X.-L. Zhang, and J.-M. Bai (YNAO) report:




We observed the field of GRB 210104A (Troja et al. GCN 29233) with

the 2.4-meter optical telescope at Gao-Mei-Gu (GMG) station of Yunnan

Observatories. The observation began at UT 13:00:11, 4, Jan. 2021, about

1.5 hours after the trigger. We clearly detected the source, and the preliminary

magnitude was measured to be R~17.6. Further analysis of the observations during

the night is ongoing.