GCN Circular 36833
Subject
EP240703b: TRT optical upper limits
Date
2024-07-05T15:25:56Z (5 months ago)
From
S. Tinyanont at National Astronomical Research Institute of Thailand <samaporn@narit.or.th>
Via
Web form
S. Tinyanont, R. Anutarawiramkul, P. Butpan (NARIT), X. Liu, S.Q. Jiang, J. An, S.Y. Fu, Z.P. Zhu, D. Xu, Z. Fan, W.X. Li, N.C. Sun, Y.N. Wang (NAOC) report on behalf of a large collaboration:
We observed the field of the fast X-ray transient EP240703b (Peng et al., GCN 36810) using the 0.7-m telescope of the Thai Robotic Telescope (TRT) network, located at Spring Brook Observatory, Australia. Observations started at 09:09:53 UTC on 2024-07-04, i.e., 1.16 day after the EP trigger, and 5 x 360 s frames in the R- & I- bands were obtained, respectively.
No uncatalogued optical transient is detected in the stacked image within the 3-arcmin EP/WXT error circle, down to a 5-sigma limiting magnitudes of R ~ 21.3 and I ~ 20.4, calibrated with SkyMapper sources in the field.