TITLE:   GCN CIRCULAR
NUMBER:  46056
SUBJECT: GRB 261026A: Upper Limit with 60cm Panzhihua Telescope
DATE:    26/10/27 06:04:05 GMT
FROM:    Jiewei Zhao at SWIFAR, YNU <meow.jiewei.zhao@gmail.com>

Jiewei Zhao, Wenyu Li, Brajesh Kumar, Xinchao Wang, Guowang Du, Yuanpei Yang (SWIFAR, YNU), Binbin Zhang, Kamil Nadaf (NJU), Kai Liao, Xinyu Wang, Xing Yao, Yang Zeng and Chunlai Zhang (SSO) report on behalf of a larger collaboration:

We observed the GRB 261026A field detected by SVOM/ECLAIRs and SVOM/GRM (Goto et al., GCN 46030). The observations were initiated at 2026-10-26T12:01:07.78 (~5.86 hours after the trigger) with the 60cm Panzhihua Telescope located at the Sichuan South Observatory (SSO), China. A total of 8 frames with 180s exposure each were acquired in L band. We did not detect the optical counterpart (Dornic et al., GCN 46033; Zheng et al., GCN 46034; Wu et al., GCN 46035; Mohan et al., GCN 46041; Li et al., GCN 46046; Shi et al., GCN 46047; Morín-González et al., GCN 46048; Coyo et al., GCN 46054) in the stacked image. The 3-sigma upper limit is 20.54 mag (The expected Galactic extinction is not applied in our estimates).