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 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.