GCN Circular 31475
Subject
GRB 220117B: Nanshan/NEXT optical upper limit
Event
Date
2022-01-18T03:25:24Z (4 years ago)
From
Dong Xu at NAOC/CAS <dxu@nao.cas.cn>
S.Y. Fu (NAOC), Z.P. Zhu (NAOC,HUST), X. Liu, S.Q. Jiang, D. Xu (NAOC),
X. Gao (Urumqi No.1 Senior High School), J.Z. Liu (XAO) report:
We observed the field of GRB 220117B detected by Swift (Melandri et al.,
GCN 31468) using the NEXT-0.6m telescope located at Nanshan, Xinjiang,
China. Observations automatically started at 20:07:36 UT on 2022-01-17,
i.e., 128 s after the BAT trigger, and a series of 40 s, 60 s, 90 s
frames were obtained in the Sloan r-band.
No uncatalogued optical transient is detected in our stacked images at
the Swift-XRT position (GCN 31468), down to limiting magnitudes of
r~18.5, calibrated with the nearby PanSTARRS field.