{
  "circularId": 44844,
  "submitter": "SVOM_group <svomgroup@bao.ac.cn>",
  "eventId": "GRB 260604C",
  "createdOn": 1780694568797,
  "body": "A. Saccardi (CEA/Irfu), D. B. Malesani (DAWN/NBI and Radboud), S. Bisero (CEA/Irfu) report on behalf of the SVOM mission team:\n\nWe observed the field of GRB 260604C (Fermi GBM Team, GCN 44822; Gotz et al., GCN 44823) with the LCO 1m telescope at South African Astronomical Observatory equipped with the Sinistro instrument.\n\nOur observation started on 2026-06-05 at 20:08:32 UT (about 1 day after the trigger) and we obtained 3x200 s exposures in the SDSS r filter.\n\nIn the stacked image we do not detect the optical counterpart (Lipunov et al., GCN 44827; Konno et al., GCN 44828; Zhu et al., GCN 44832, Becerra et al., GCN 44834; Hellot et al., GCN 44835; Gompertz et al., GCN 44837; Gompertz et al., GCN 44843). We measure the following upper limit calibrated against the Pan-STARRS catalog, and not corrected for Galactic extinction:\n\nr > 21.8 AB (3-sigma, mid-time 0.997 days after the trigger).\n\nThis project is funded by the SVOM collaboration.",
  "subject": "GRB 260604C: LCO optical upper limit",
  "submittedHow": "web",
  "format": "text/plain"
}