TITLE:   GCN CIRCULAR
NUMBER:  35237
SUBJECT: GRB 231129A: JinShan optical upper limit
DATE:    23/11/30 16:47:03 GMT
FROM:    Dong Xu at NAOC/CAS <dxu@nao.cas.cn>

X. Liu, Z.P. Zhu, J. An, S.Q. Jiang, S.Y. Fu, T.H. Lu, D. Xu (NAOC), S.W Luo, M.M. Yang, Z. K. Feng, L.F. Huo (XJTS) report on behalf of a large collaboration:

We observed the field of GRB 231129A detected by Swift (J.D. Gropp, GCN 35208), INTEGRAL (S.Mereghetti et al., GCN 35209), and GECAM-C (Wen-Long Zhang et al., GCN 35210), using the  100cm C telescope (100C) located at Altay, Xinjiang, China. Observations started at 12:13:36.29 UT on 2023-11-29, i.e., 7.13 hr after the Swift/BAT trigger, and 30*120s frames are obtained in the Sloan-r band.

No credible optical transient is detected in our stacked images within the refined Swift/XRT error region (Burrows et al., GCN 35218), down to a 3-sigma upper limit of r > 21.6 mag, calibrated with nearby PanSTARRS stars and not corrected for Galactic extinction.