{
  "body": "S.Y. Fu, T.H. Lu, S.Q. Jiang, X. Liu, Z.P. Zhu, D Xu (NAOC), S.W. Luo, M.M. Yang, Z. K. Feng (GYZO, NAOC) report:\n\nWe observed the field of GRB 230606A detected by Swift (Lien et al., GCN 33921) with the GOT-0.5m telescope located at Gaoyazi, Xinjiang, China. We obtained 20x180 s frames in the Sloan r-band and 15x180 s frames in the Sloan z-band, starting at 16:25:45 UT on 2023-06-06, i.e., 16.18 hr after the Swift/BAT trigger.\n\nNo optical source is detected in our stacked images at the enhanced XRT position (Goad et al., GCN 33924), and preliminary photometric results are as follows:\n\nT_mid-T0 (hr)    Filter   Upper_Limit (3-sigma)\n    16.74                r          >20.9\n    18.05                z          >18.1\n\ncalibrated with the nearby PanSTARRS field and not corrected for Galactic extinction.\n\n\n",
  "createdOn": 1686104171410,
  "eventId": "GRB 230606A",
  "circularId": 33932,
  "subject": "GRB 230606A: Gaoyazi/GOT optical upper limit",
  "submitter": "Dong Xu at NAOC/CAS <dxu@nao.cas.cn>",
  "bibcode": "2023GCN.33932....1F"
}