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GCN Circular 32727

GRB 221009A: GMG observation
2022-10-13T03:01:54Z (2 years ago)
Jirong Mao at Yunnan Obs <>
J. Mao, K.-X. Lu, X.-H. Zhao, and J.-M. Bai (YNAO) report:

We observed the field of GRB 221009A (Dichiara et al. GCN 32632) with the 2.4-meter optical

telescope at Gao-Mei-Gu (GMG) station of Yunnan Observatories. The observation began at

UT 14:34:40, 12, Oct. 2022, about 3 days after the trigger. We marginally detected the

afterglow. The preliminary magnitude was measured to be z~18.9. We caution that the magnitude

has a relatively large uncertainty due to the very poor seeing.
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