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GCN Circular 33697

GRB 230427A: GMG upper limit
2023-04-28T03:50:39Z (5 months ago)
Jirong Mao at Yunnan Obs <>
J. Mao, H.-C. Feng, and J.-M. Bai (YNAO) report:

We observed the field of GRB 230427A (Troja et al. GCN 33687) by the GMG telescope in Yunnan observatories.
The observation began from UT 14:52:28 April 27, 2023, about 4.3 hours from the trigger. We could not observe the optical
afterglow down to a magnitude limit of R~20.6.
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