{
  "eventType": [
    "GRB",
    "Optical Transient"
  ],
  "editedOn": 1791809487886,
  "format": "text/markdown",
  "editedBy": "Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of Rui-Zhi Li at Yunnan Observatories, CAS <liruizhi@ynao.ac.cn>",
  "body": "R.-Z. Li, B.-T. Wang, F.-F. Song, J. Mao, K.-X. Lu, J.-G. Wang and B. Wang (YNAO, CAS) report:\n\nWe observed the field of GRB 261011A (Huang et al., GCN 45895; Cenko et al., GCN 45896; T0 at 2026-10-11T13:46:41) using the GMG-2.4m telescope at the Lijiang Observatory. \nThe observation began at 2026-10-11T16:41:50, about 2.92 hours after the trigger.\n\nThe optical counterpart reported by Swift-UVOT (Cenko et al., GCN 45896) and by other facilities (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) was detected in an r-band image.\n\nThe preliminary analysis results are shown as follows:\n\n\n|   Start time [UTC]     |  Exposure [s]  |  Tmid-T0 [h]  |  Filter  |  AB Magnitude  |  5-sigma U.L.|\n|----------------------- | -------------- |-------------  | -------- | -------------- | --------------|\n|2026-10-11 16:41:50.018 |     300        |    2.961      |   r      | 20.46 ± 0.04   |     22.2     |\n\nThe given magnitudes are derived based on calibration against Legacy Survey DR10 field stars, and are not corrected for the expected Galactic foreground extinction, corresponding to a reddening of E(B-V) = 0.019 mag in the direction of the optical counterpart (Schlafly & Finkbeiner 2011).",
  "version": 2,
  "circularId": 45915,
  "eventId": "GRB 261011A",
  "submittedHow": "web",
  "createdOn": 1791770300809,
  "submitter": "Rui-Zhi Li at Yunnan Observatories, CAS <liruizhi@ynao.ac.cn>",
  "subject": "GRB 261011A: GMG Optical Observation"
}