GCN Circular 32335
Subject
GRB 220706A: Nanshan/NEXT optical upper limits
Date
2022-07-07T02:45:18Z (3 years ago)
From
Dong Xu at NAOC/CAS <dxu@nao.cas.cn>
S.Q. Jiang (NAOC), 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 220706A detected by Swift (D'Ai et al., GCN
32329) using the NEXT-0.6m telescope located at Nanshan, Xinjiang,
China. We obtained 7x200 s frames in the Sloan r-band and 5x200 s frames
in the Sloan z-band, starting at 20:21:09 UT on 2022-07-06, i.e., 4.2 hr
after the BAT trigger.
No optical source is detected in our stacked images at the enhanced XRT
position (Goad et al., GCN 32333), with upper limits as follows:
T_mid-T0 (hr) Filter Upper limit(3-sigma)
4.41 r >20.7
4.79 z >18.8
calibrated with the nearby PanSTARRS field and not corrected for
Galactic extinction.