GCN Circular 44376
Subject
EP260416a: J band upper limit by SYSU 80cm infrared telescope
Event
Date
2026-04-21T11:00:51Z (2 days ago)
From
lijj328@mail2.sysu.edu.cn
Via
Web form
Jin-Ji Li, Hao-Nan Yang, Chun Chen, Duo-Le Cao, Zhong-Nan Dong, Rui-Chen Gao, Wei-Sen Huang, Jia-Qi Lin, Pu Lin, Yun Shi, Yan Yu, P H Thomas Tam, Rong-Feng Shen, Bin Ma (Sun Yat-sen University) report on behalf of the SYSU 80cm infrared telescope team:
We observed the field of the fast X-ray transient EP260416a (Hu et al., GCN 44307) using the Sun Yat-sen University (SYSU) 80cm infrared telescope. Our observations were carried out on 2026 Apr 19 18:39 UT, 85.1 hours after the trigger, using stacked images in the J band.
We do not detect any counterpart at the position of the optical counterpart (Ducoin et al., GCN 44310; Li et al., GCN 44315; Hua et al., GCN 44318; Lee et al., GCN 44319; Zheng et al., GCN 44321; Martin-Carrillo et al., GCN 44328; Li et al., GCN 44334, He et al. GCN 44336, An et al. GCN 44339, Jelinek et al. GCN 44341; Guziy et al., GCN 44351; Ho et al., GCN 44354), down to a 5-sigma depth of J ~ 18.1 Vega magnitudes.
The SYSU 80 cm infrared telescope is operated and managed by the Department of Astronomy, Sun Yat-sen University.