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GCN Circular 41671

Subject

EP250827b / AT 2025wkm: TRT optical observations

Event

EP250827b

Date

2025-09-03T15:06:38Z (10 days ago)

Edited On

2025-09-03T15:35:24Z (10 days ago)

From

L. B. He at NAOC <helb@bao.ac.cn>

Edited By

Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of L. B. He at NAOC <helb@bao.ac.cn>

Via

Web form

L.B. He (NAOC), K. Noysena, K. Chanchaiworawit, S. Tinyanont, R. Anutarawiramkul, P. Butpan (NARIT), S.Y. Fu (HUST), J. An, 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 followed up the optical transient AT 2025wkm

, which is potentially associated with EP250827b (Schroeder et al., GCN ). Our first epoch was carried out at the 0.7-m telescope of the Thai Robotic Telescope network (TRT), located at Fresno, California, U.S.A (SRO), approximately 5.04 days after the EP X-ray flare. And we obtained several frames in the R band.

The counterpart (Schroder et al., GCN 41635

; Hall et al., GCN ; Hall et al., GCN ; Eyles-Ferris et al., GCN ; Ma et al., GCN ; Eyles-Ferris et al., GCN ) was clearly detected in the stacked image, with R = 19.62 +/- 0.04 (Vega), calibrated with Pan-STARRS DR2 catalog and not corrected for Galactic extinction.