{
  "submitter": "wenly8@mail2.sysu.edu.cn",
  "format": "text/plain",
  "submittedHow": "web",
  "createdOn": 1791898911731,
  "subject": "GRB 261011A: Later-epoch J-band upper limit from the SYSU 80 cm infrared telescope",
  "eventType": [
    "GRB"
  ],
  "body": "Lu-Yao Wen, Jian-Hong Cao, Zhong-Nan Dong, Jin-Ji Li, Jia-Qi Lin, Pu Lin, Yun Shi, Hao-Nan Yang, Rui-Chen Gao, Jing-Kai Sun, 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 carried out further J-band observations of GRB 261011A using the Sun Yat-sen University (SYSU) 80 cm infrared telescope. We observed from 2026 October 12 17:37:44.942 to 19:41:05.309 UT, 27.85–29.91 hours after the Swift/BAT trigger. Our earlier J-band detections were reported in Huang et al. (GCN 45913).\n\nWe do not detect the source at the position of the counterpart (Cenko et al., GCN 45896; O'Neill et al., GCN 45897; Fu et al., GCN 45898; Izzo et al., GCN 45899; Wu et al., GCN 45900; Yin et al., GCN 45901; Shi et al., GCN 45903; Aryan et al., GCN 45904; Arya et al., GCN 45907; Izzo et al., GCN 45909; Huang et al., GCN 45913; Bochenek et al., GCN 45914; Li et al., GCN 45915; Zhao et al., GCN 45916; Takahashi et al., GCN 45917; Monsalves et al., GCN 45920; Cheng et al., GCN 45922), down to a 5-sigma limiting magnitude of J > 19.6 mag (Vega).\n\nThe limiting magnitude was calibrated against nearby stars from the 2MASS catalog and is reported in the Vega system, without correction for Galactic extinction. The SYSU 80 cm infrared telescope is operated and managed by the Department of Astronomy, Sun Yat-sen University.",
  "circularId": 45942,
  "eventId": "GRB 261011A"
}