[vsnet-grb-info 27845] ZTF21aayokph (AT2021lfa): Nanshan/NEXT optical upper limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  29948
SUBJECT: ZTF21aayokph (AT2021lfa): Nanshan/NEXT optical upper limit
DATE:    21/05/06 07:59:38 GMT
FROM:    Dong Xu at NAOC/CAS  <dxu at nao.cas.cn>

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 ZTF21aayokph (AT2021lfa) (Yao, Perley, & Ho, 
GCN 29938) using the NEXT-0.6m telescope located at Nanshan, Xinjiang, 
China. We obtained 6x300 s frames in the Sloan r-band, starting at 
19:35:55 UT on 2021-05-05, i.e., ~ 38.02 hr after the ZTF detection in 
r-band.

The optical transient is not detected in our stacked image, down to a 
limiting magnitude of r ~ 21.2, calibrated with the nearby PanSTARRS field.