GCN Circular 46237
Subject
EP261111a: K and J band upper limits by SYSU 80cm infrared telescope
Event
Date
2026-11-12T11:43:24Z (an hour ago)
From
linp@mail2.sysu.edu.cn
Via
Web form
Pu Lin, Jin-Ji Li, Zhi-Xiang Tan, Zhong-Nan Dong, Yun Shi, Rui-Chen Gao, Jia-Qi Lin, Hao-Nan Yang, Hao-Ran Zhang, Jian-Hong Cao, Shu-Quan Bai, Si-Rui Huang, Jing-Kai Sun, Lu-Yao Wen, P. H. Thomas Tam, Rong-Feng Shen, and Bin Ma (Sun Yat-sen University) report on behalf of the SYSU 80cm infrared telescope team:
We observed the field of EP261111a detected by the Einstein Probe (G. L. Huang et al., GCN 46226 and Z. X. Li et al., GCN 46235) with the Sun Yat-sen University 80cm infrared telescope in the K and J bands. The observations were carried out in the K band on 2026-11-11 from 15:02:09 to 15:41:58 UT (1.62 - 2.28 hr after the EP/WXT trigger) using stacked images (113 x 20s, 2260 s total exposure), and in the J band on 2026-11-11 from 16:40:41 to 17:41:30 UT (3.26 - 4.27 hr after the EP/WXT trigger) using stacked images (172 x 20s, 3440 s total exposure).
We do not detect any new source within the localization (RA = 43.1193 deg, Dec = +44.4351 deg, J2000; 10 arcsec uncertainty; reported by Einstein Probe, Z. X. Li et al., GCN 46235) in our stacked images, and obtain 5-sigma upper limits of K = 17.83 mag (Vega) and J = 19.83 mag (Vega).
The photometry was calibrated against nearby stars from the 2MASS catalog and is reported in the Vega system, without correction for Galactic extinction.
The SYSU 80cm infrared telescope is operated and managed by the Department of Astronomy, Sun Yat-sen University.