T.H. Lu, S.Q. Jiang, S.Y. Fu, X. Liu (NAOC), Z.P. Zhu (NAOC, HUST), D.
Xu (NAOC), X. Gao (Urumqi No.1 Senior High School), J.Z. Liu (XAO) report:
We observed the field of GRB 230328B detected by Swift (Gropp et al.,
GCN 33527),using the NEXT-0.6m optical telescope located at Nanshan,
Xinjiang, China. Observations started at 16:39:57 UT on 2023-03-28,
i.e., 1.75 hr after the Swift/BAT trigger.
The previously reported optical afterglow (e.g., Pankov et al., GCN
33528; Belkin et al., GCN 33530) is marginally detected in our stacked
image. Preliminary photometry of the afterglow has r ~ 19.1 mag,
calibrated by nearby PanSTARRS stars.