GCN Circular 45109
Subject
EP260707a: TRT optical upper limit
Event
Date
2026-07-07T19:33:31Z (2 days ago)
From
liuxing@nao.cas.cn
Via
Web form
X. Liu (NAOC), K. Noysena, K. Chanchaiworawit, S. Tinyanont (NARIT), S.Y. Fu (HUST), S.Q. Jiang, J. An, L.B. He, Z.P. Zhu, D. Xu (NAOC) report:
We observed the field of EP260707a detected by EP (Zhou et al., GCN 45107) using the 0.7-m telescope of the Thai Robotic Telescope network (TRT), located at New South Wales, Australia (SBO). 4x300s frames in the R-band were obtained at a median time of 1.52 hr post-trigger.
No uncatalogued optical transient is detected in the stacked image within the EP/FXT error circle (Zhou et al., GCN 45107), down to a 5-sigma limiting magnitude of R ~ 21.0 (Vega), calibrated with Pan-STARRS DR2 stars in the field converted using Lupton (2005) equations and not corrected for Galactic extinction.