GCN Circular 45589
Subject
GRB 260915A: J-band upper limit by SYSU 80cm infrared telescope
Event
Date
2026-09-15T18:42:53Z (13 days ago)
From
lijj328@mail2.sysu.edu.cn
Via
Web form
Jin-Ji Li, Chun Chen, Duo-Le Cao, Zhong-Nan Dong, Rui-Chen Gao, Jia-Qi Lin, Pu Lin, Yun Shi, Hao-Nan Yang, 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 GRB 260915A, detected by SVOM/Eclairs (Liang et al., GCN 45570), with the Sun Yat-sen University (SYSU) 80cm infrared telescope. Our observations were carried out on 2026 Sep 15 from 14:37:04 to 17:54:33 UT, i.e. ~13.4-16.7 hours after the trigger (mid-time 15.1 hr), using stacked images in the J band (522 x 20 s, 2.90 hr total exposure).
We do not detect any source within the error box of source 1 reported by EP-FXT (EPF_J003237.9+081455; R.A., Decl. = 00:32:37.85, +08:14:54.96, J2000; Shi et al., GCN 45587) in our stacked J-band image, down to a 5-sigma depth of J ~ 19.7 Vega mag.
Our non-detection is consistent with the non-detections reported by Yin et al. (GCN 45573), Wu et al. (GCN 45575), Zhu et al. (GCN 45577), Perez-Garcia et al. (GCN 45578), Ducoin et al. (GCN 45580), Li et al. (GCN 45581), Brivio et al. (GCN 45584) and Shi et al. (GCN 45588).
The SYSU 80 cm infrared telescope is operated and managed by the Department of Astronomy, Sun Yat-sen University.