Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 31368

GRB 220101A: GMG observation (2nd epoch)
2022-01-02T13:50:03Z (2 years ago)
Jirong Mao at Yunnan Obs <>
J. Mao, B.-L. Lun, and J.-M. Bai (YNAO) report:

We observed the field of GRB 220101A (Tohuvavohu et al. GCN 31347) with the 2.4-meter optical

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

UT 11:39:51, 2, Jan. 2022, about 30.5 hours after the trigger. We still clearly detected the

afterglow. The preliminary magnitude was measured to be R~20.1. We encourage the continued

follow-up observations.
Looking for U.S. government information and services? Visit