GCN Circular 37186
Subject
EP240816b: TRT optical upper limit
Date
2024-08-16T12:34:32Z (a month ago)
From
Dong Xu at NAOC/CAS <dxu@nao.cas.cn>
Via
Web form
J. An, S.Q. Jiang (NAOC), S. Tinyanont, R. Anutarawiramkul, P. Butpan (NARIT), X. Liu, S.Y. Fu, Z.P. Zhu, S.Y. Gao, 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 EP240816b (Yang et al., GCN 37185) using the 0.7-m telescope of the Thai Robotic Telescope network (TRT), located at Fresno, California, U.S.A. Observations started at 07:10:37 UTC on 2024-08-16, i.e., 5.436 hr after the EP trigger, and 4 x 300 s frames were obtained in R-band.
No uncatalogued optical source is detected in the stacked image within the 10-arcsec EP/FXT error circle, down to a 5-sigma limiting magnitude of R ~ 20.0, calibrated with PanSTARRS sources in the field.