[vsnet-grb-info 27100] GRB 201229A: Nanshan/NEXT optical upper limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  29203
SUBJECT: GRB 201229A: Nanshan/NEXT optical upper limit
DATE:    20/12/30 03:53:43 GMT
FROM:    Dong Xu at NAOC/CAS  <dxu at nao.cas.cn>

S.Y. Fu (NAOC), Z.P. Zhu (HUST,NAOC), X. Liu, D. Xu (NAOC), X. Gao 
(Urumqi No.1 Senior High School), J.Z. Liu (XAO) report:

We observed the field of GRB 201229A (Sbarufatti et al., GCN 29192) 
using the NEXT-0.6m telescope located at Nanshan, Xinjiang, China. We 
obtained 5 x 200 s frames in the Sloan r-band, starting at 19:52:23 UT 
on 2020-12-29, i.e., 8.88 hr after the burst.

No optical source is detected in our stacked image at the Swift/UVOT 
position (Sbarufatti et al., GCN 29192), down to a upper limiting of 
r~20.4, calibrated with the nearby PanSTARRS field.