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 210822A (Page et al., GCN 30677) using the
NEXT-0.6m telescope located at Nanshan, Xinjiang, China. We obtained
15x100 s frames in the Sloan r-band and 10x100 s frames in the V-band,
starting at 14:42:53 UT on 2021-08-22, i.e., 5.41 hr after the BAT trigger.
The optical afterglow (e.g., Page et al., GCN 30677; Zheng & Filippenko,
GCN 30679) of the burst is clearly detected in our stacked images.
Preliminary photometry results are as follows:
Tmid (UT) Tmid-T0(day) Mag MagErr Filter
2021-08-22T14:58:04 0.236 18.53 0.06 r
2021-08-22T15:54:29 0.275 18.88 0.08 V
calibrated with nearby PanSTARRS stars.