TITLE: GCN CIRCULAR NUMBER: 41387 SUBJECT: GRB250814A: TRT optical upper limits DATE: 25/08/15 09:39:01 GMT FROM: sqjiang at NAOC sqjiang@bao.ac.cn
S.Q. Jiang (NAOC), K. Noysena, K. Chanchaiworawit, S. Tinyanont (NARIT), L.B. He, J. An, X. Liu, Z.P. Zhu, D. Xu (NAOC), S. Y. Fu (HUST) report on behalf of a large collaboration:
We observed the field of GRB 250814A detected by Swift (Caputo et al., GCN 41358) and Fermi (Fermi GBM team, GCN 41357), using the 0.7-m telescope of the Thai Robotic Telescope network (TRT), located at Sierra Remote Observatories in California. We obtained several 180 s frames in the R and I filters. The observation started at 07:44:15.35 UTC on 2025-08-14, i.e., 9.27 mins after the Swift/BAT trigger time.
No new optical source is detected within the Swift/XRT enhanced error circle (Caputo et al., GCN 41358) down to R > 20.7 and I > 19.7 at about 17.3 mins post-burst, calibrated with nearby Pan-STARRS DR2 stars and not corrected for Galactic extinction.
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