TITLE:   GCN CIRCULAR
NUMBER:  37842
SUBJECT: EP241021a: TRT optical observations
DATE:    24/10/23 06:02:51 GMT
FROM:    Dong Xu at NAOC/CAS <dxu@nao.cas.cn>

S.Y. Fu (NAOC), S. Tinyanont, R. Anutarawiramkul, P. Butpan (NARIT), S.Q. Jiang, J. An, X. Liu, Z.P. Zhu, S.Y. Gao, Z. Fan, W.X. Li, N.C. Sun, Y.N. Wang, D. Xu (NAOC) report on behalf of a large collaboration:

We observed the field of EP241021a detected by Einstein Probe (EP, Hu et al., GCN 37834) using the 0.7-m telescope of the Thai Robotic Telescope network (TRT), located at Fresno, California, US. Observations started at 09:14:23.699 UTC on 2024-10-22, i.e., 1.17 days after the EP trigger, and a series of 300 s frames were obtained in R- and V- bands.

The uncatalogued source reported by NOT (Fu et al., GCN 37840) is marginally detected in our stacked R- and V- band images, with R ~ 21.6 and V ~ 21.7, calibrated with Legacy-DR10 stars in the field and not corrected for Galactic extinction.