{
  "eventId": "GRB 261113A",
  "eventType": [
    "GRB",
    "X-ray Transient",
    "Afterglow",
    "Optical Transient"
  ],
  "createdOn": 1794588583009,
  "submittedHow": "web",
  "submitter": "SVOM_group <svomgroup@bao.ac.cn>",
  "circularId": 46250,
  "format": "text/plain",
  "subject": "GRB 261113A : SVOM/GWAC-F60 optical afterglow detection",
  "body": "S.J. Yin (GXU), Y.X. Guan,C. Wu, L.P. Xin, L.J. Chen, X.H. Han, P.P. Zhang, J.L. Wang (NAOC), Y.Y. Shi, E.W. Liang, X.G. Wang(GXU) report on behalf of the SVOM follow-up team:\n \nWe observed the field of GRB261113A detected by SVOM/ECLAIRs (A. Saccardi et al., GCN 46244), with the GWAC-F60 at Xinglong Observatory, China. F60 started observing 2026-11-13 from 14:32:41.4 to 14:51:35.7 UTC.\n\nWe found a candidate at RA, DEC = 346.32051 , 5.17192 degrees: \nR.A. (J2000) = 23h05m16.92s\nDec. (J2000) = +05d10m18.91s\nwith an uncertainty of ~ 0.5 arcsec.\nThe coordinates are consistent with those provided by the SYSU 80cm (Lin et al., GCN 46247）.The optical counterpart faded from 16.1 to 18.5 mag over a time span of ~ 19 min（Lei et al., GCN 46248; Li et al., GCN 46249). \nWe measure the following magnitudes calibrated against the USNO-B1.0 catalog, and not corrected for Galactic extinction.\n\nTwo 60cm GWAC-F60(A/B) are operated by Guangxi University and NAOC, CAS, at Xinglong Observatory, China. The field of view is 19*19 arcmin."
}