GCN Circular 45668
Subject
EP260920b: LCO optical counterpart detection
Event
Date
2026-09-21T02:13:34Z (a day ago)
From
liuxing@nao.cas.cn
Via
Web form
X. Liu, D. Xu, J. An, Z. Fan, J.F. Gou, L.B. He, S.Q. Jiang, W.X. Li, R.D. Liang, Q. Zhao, Z.P. Zhu (NAOC), S.Y. Fu, L. Lei (HUST), Y.L. Hua (PMO) report:
We observed the field of EP260920b detected by EP (Ni et al., GCN 45664), using an LCO 1m telescope network. We obtained 3*200s exposures in the SDSS r' filter.
An uncatalogued and decaying source is detected within the EP-FXT error circle (Ni et al., GCN 45664) at coordinates
R.A. (J2000) = 21:42:20.79
Dec. (J2000) = -28:02:24.4
with an uncertainty of ~ 0.5 arcsec. The source had r = 18.97 +/- 0.04 mag at a median time of 0.68 hr post-trigger, calibrated with Pan-STARRS DR2 and not corrected for Galactic extinction.
We thus think the source is the optical counterpart of EP260920b.