{
  "createdOn": 1785137640283,
  "bibcode": "2026GCN.45223....1S",
  "eventId": "GRB 260727A",
  "subject": "GRB 260727A: LCO optical upper limits",
  "submittedHow": "web",
  "submitter": "SVOM_group <svomgroup@bao.ac.cn>",
  "body": "Y.Y. Shi (GXU), C. Wu, L.P. Xin (NAOC), A. Saccardi, D. Turpin (CEA/Irfu), Z.M. Wang, R.Z. Li (BA-F) report on behalf of the SVOM mission team:\n\n\nWe observed the field of GRB 260727A (SVOM burst-id sb26072701) detected by SVOM (Li et al., GCN 45220) with the LCO 1m telescope at Tenerife Observatory equipped with the Sinistro instrument.\n\nOur observation started on 2026-07-27 at 02:31:21 UT (about 2.16 hr after the trigger) and we obtained 3x200 s exposures in the Pan-STARRS z filters.\n\nIn the stacked image, we do not detect any new source within the SVOM/ECLAIRs error box. We measure the following upper limit calibrated against the Pan-STARRS DR1 catalog, and not corrected for Galactic extinction:\n\nz > 20.2 AB (5-sigma, mid-time 2.25 hr after the trigger).\n\nThis project is funded by the SVOM collaboration.",
  "circularId": 45223,
  "format": "text/plain"
}