{
  "format": "text/plain",
  "circularId": 43565,
  "subject": "EP260128a: J band upper limit by SYSU 80cm infrared telescope",
  "submittedHow": "web",
  "body": "Pu Lin, Jin-Ji Li, Hao-Nan Yang, Zhong-Nan Dong, Yan Yu, Jia-Qi Lin, Wei-Sen Huang, Chun Chen, Duo-Le Cao, 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 EP260128a (Zhou et al., GCN 43549) using the Sun Yat-sen University 80cm infrared telescope with 167 x 20 s exposures in J band. The calculated position is RA = 128.32533 deg, DEC = -10.27565 deg J2000, from EP/FXT observation (Zhou et al., GCN 43554). Our observations began at 2026-1-29 20:00:00 UTC, 20.33 hours after the EP trigger.\n \nWe do not detect any counterpart at the position of the optical afterglow (H. L. Li et al., GCN 43551, J. A. Quirola-Vasquez et al., GCN 43552, R. A. J. Eyles-Ferris et al., GCN 43553, L.B. He et al., GCN 43555), down to a 5-sigma depth of J~ 18.5 Vega magnitudes. \n \nThe SYSU 80cm infrared telescope is operated and managed by the Department of Astronomy, Sun Yat-sen University.",
  "createdOn": 1769748168923,
  "bibcode": "2026GCN.43565....1L",
  "submitter": "linp@mail2.sysu.edu.cn",
  "eventId": "EP260128a"
}