{
  "format": "text/plain",
  "body": "Y.Y. Shi (GXU), C. Wu, L.P. Xin (NAOC), A. Saccardi, D. Turpin (CEA/Irfu), Bertrand Cordier (CEA), Hatsune Goto (RIKEN, CEA), report on behalf of the SVOM mission team:\n\n\nWe observed the field of GRB 260818B (SVOM burst-id sb26081807) detected by SVOM (Cordier et al., GCN 45398) with the LCO 1m telescope at South African Astronomical Observatory equipped with the Sinistro instrument.\n\nOur observation started on 2026-08-18 at 23:44:55 UT (about 3.56 hr after the trigger) and we obtained 3x200 s exposures in the SDSS r and PS1 zs filter.\n\nIn the stacked image, we do not detect any new source within the SVOM/ECLAIRs error box. We measure the following upper limits calibrated against the Pan-STARRS DR1 catalog, and not corrected for Galactic extinction:\n\nr > 21.9  AB (5-sigma, mid-time 3.65 hr after the trigger),\nz > 19.7  AB (5-sigma, mid-time 3.65 hr after the trigger).\n\nThis project is funded by the SVOM collaboration.\n",
  "eventType": [
    "GRB",
    "Optical Transient"
  ],
  "subject": "GRB 260818B: LCO optical upper limits",
  "submitter": "SVOM_group <svomgroup@bao.ac.cn>",
  "createdOn": 1787110933408,
  "circularId": 45399,
  "eventId": "GRB 260818B",
  "submittedHow": "web"
}