{
  "body": "Jing-Kai Sun, Jin-Ji Li, Zhong-Nan Dong, Jia-Qi Lin, Pu Lin, Yun Shi, Hao-Nan Yang, Rui-Chen Gao, Hao-Ran Zhang, P H Thomas Tam, Rong-Feng Shen, Bin Ma (Sun Yat-sen University) report on behalf of the SYSU 80cm infrared telescope team:\n\nWe observed the field of the X-ray transient EP261007b (Wen et al., GCN 45847) using the Sun Yat-sen University (SYSU) 80cm infrared telescope. Our observations were carried out on 2026 Oct 08 from 17:09 to 18:10 UT, 26.1 hours after the EP/WXT trigger, using stacked images in the J band (180 x 20 s, 1hr total exposure).\n\nWe do not detect any new source within the FXT localization (Wen et al., GCN 45847), nor at the position of the variable source reported by Quirola-Vasquez et al. (GCN 45864) at RA, Dec = 23:45:22.41, +11:20:25.8 (J2000), in our stacked J-band image. We obtain a 5-sigma upper limit of J ~ 20.0 mag (Vega).\n\nOur non-detection is consistent with the non-detections reported by Ma et al. (GCN 45849), Zhang et al. (GCN 45860), Mohan et al. (GCN 45861), Shi et al. (GCN 45862), and Quirola-Vasquez et al. (GCN 45864).\n\nThe SYSU 80 cm infrared telescope is operated and managed by the Department of Astronomy, Sun Yat-sen University.\n",
  "format": "text/plain",
  "submittedHow": "web",
  "eventType": [
    "X-ray Transient"
  ],
  "eventId": "EP261007b",
  "circularId": 45873,
  "createdOn": 1791548975389,
  "subject": "EP261007b: J-band upper limit by SYSU 80cm infrared telescope",
  "submitter": "sunjk7@mail2.sysu.edu.cn"
}