{
  "format": "text/plain",
  "circularId": 43616,
  "eventId": "GRB 260204A",
  "bibcode": "2026GCN.43616....1T",
  "submittedHow": "web",
  "submitter": "SVOM_group <svomgroup@bao.ac.cn>",
  "createdOn": 1770239788799,
  "body": "D. Turpin (CEA/Irfu), A. Saccardi (CEA/Irfu), D. B. Malesani (DAWN/NBI and Radboud), B. Cordier (CEA/Irfu), report on behalf of the SVOM mission team:\n\nWe observed the field of GRB 260204A (Pillas et al., GCN 43613) with the LCO 1-m telescope at Siding Spring Observatory equipped with the Sinistro instrument.\n\nOur observation started on 2026-02-04 at 15:10:42 UT (about 22 min after the trigger) and we obtained 3x200 s in each of the SDSS r and Pan-STARRS z filters. In the stacked image, we do not detect any new source within the SVOM/ECLAIRs error box.\n\nWe measure the following upper limit calibrated against the PanSTARRS DR1 catalog, and not corrected for Galactic extinction:\n\nr > 20.3 AB (5-sigma, mid-time 25.7 min after the trigger);\nz > 19.4 AB (5-sigma, mid-time 38.4 min after the trigger).\n\nThis project is funded by the SVOM collaboration.",
  "subject": "GRB 260204A: LCO optical upper limits"
}