GCN Circular 29700
Subject
GRB 210323A: Nanshan/NEXT optical upper limit
Event
Date
2021-03-23T23:09:33Z (5 years ago)
From
Dong Xu at NAOC/CAS <dxu@nao.cas.cn>
S.Y. Fu (NAOC), Z.P. Zhu (NAOC, HUST), X. Liu, D. Xu (NAOC), X. Gao
(Urumqi No.1 Senior High School), J.Z. Liu (XAO) report:
We observed the field of GRB 210323A (Gropp et al., GCN 29699) using the
NEXT-0.6m telescope located at Nanshan, Xinjiang, China. Observations
automatically started at 22:03:49 UT on 2021-03-23 (i.e., 91 s after the
BAT trigger), and 3x40 s, 4x60 s and 12x90 s frames were obtained in the
Sloan r-filter.
No optical source is detected in our stacked image at the XRT position
(Gropp et al., GCN 29699), down to a limiting magnitude of r~20.4,
calibrated with nearby PanSTARRS stars.