GCN Circular 29623
Subject
GRB 210308A: Nanshan/NEXT optical upper limits
Event
Date
2021-03-08T16:27:50Z (5 years ago)
From
Dong Xu at NAOC/CAS <dxu@nao.cas.cn>
Z.P. Zhu (NAOC, HUST), S.Y. Fu, X. Liu, D. Xu (NAOC), X. Gao (Urumqi
No.1 Senior High School), J.Z. Liu (XAO) report:
We observed the field of GRB 210308A (D'Elia et al., GCN 29619) using
the NEXT-0.6m optical telescope located at Nanshan, Xinjiang, China.
Observations started at 14:16:29 UT on 2021-03-08, i.e., 7.67 hr after
the BAT trigger. We obtained 15x200 s frames in the Sloan r- and i-
bands, respectively.
The optical afterglow (D'Elia et al., GCN 29619) of the burst is not
detected in our stacked images, down to limiting magnitudes of r ~ 21.7
and i ~ 21.3, calibrated with nearby PS1 stars.