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GCN Circular 41560

Subject
EP250827a: TRT optical observations
Event
EP250827a
Date
2025-08-27T10:36:23Z (a month ago)
From
J. An <jiean0813@foxmail.com>
Via
Web form
J. An (NAOC), S. Tinyanont, R. Anutarawiramkul, P. Butpan (NARIT), S.Y. Fu (HUST), L.B. He, X. Liu, Z.P. Zhu, S.Q. Jiang, Z. Fan, W.X. Li, N.C. Sun, Y.N. Wang, D. Xu (NAOC) report on behalf of a large collaboration:

We observed the field of EP250827a (Hua et al., GCN 41553), using the 0.7-m telescope of the Thai Robotic Telescope network (TRT), located at Cerro Tololo Inter-American Observatory, Chile. (CTO) Observations started at 08:19:45 UTC on 2025-08-27, i.e., ~ 39 min after the EP/WXT trigger and a series of frames in the r band were obtained. 

We clearly detect the optical counterpart(Levan et al., GCN 41554; Li et al., GCN 41555; Lipunov et al., GCN 41558; Gritsevich et al., GCN 41559) in our images. Preliminary photometry shows that the source has r ~ 18.93 +/- 0.03 mag at 51.6 min post-trigger, calibrated with Legacy DR10 catalog and not corrected for Galactic extinction.
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