GCN Circular 44140
Subject
EP-WXT trigger 01709259209: TRT optical counterpart detection
Date
2026-03-29T11:32:38Z (17 days ago)
Edited On
2026-03-30T14:56:40Z (16 days ago)
From
Zipei Zhu at NAOC <zpzhu@nao.cas.cn>
Edited By
Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of Zipei Zhu at NAOC <zpzhu@nao.cas.cn>
Via
Web form
Z.P. Zhu (NAOC), S. Tinyanont, K. Noysena, K. Chanchaiworawit, S. Tinyanont (NARIT), J. An, X. Liu, S.Q. Jiang, L.B. He, N.C. Sun, W.X. Li, D. Xu (NAOC), S.Y. Fu (HUST) report on behalf of a large collaboration:
We observed the field of EP260329a detected by the Einstein Probe (EP) (Trigger ID: 01709259209 ), using the 0.7-m telescope of the Thai Robotic Telescope network (TRT), located at Sierra Remote Observatories in California.
The uncatalogued source is located at:
R.A. (J2000) = 12:05:14.95
Dec.( J2000) = +4:21:05.8
with an uncertainty of ~ 0.8 arcsec.
The optical counterpart is clearly detected in the stacked image with the measured brightness of R = 18.4 +/- 0.1 at a mid-time of 10:47:20 UTC on 2026-03-29, consistant with the optical candidate reported by LCO (Li et al., GCN 44139), calibrated using nearby stars from the Pan-STARRS catalog and are not corrected for Galactic extinction.