{
  "body": "D. Turpin (CEA/Irfu), A. Saccardi (CEA/Irfu), D. B. Malesani (DAWN/NBI and Radboud), L. P. Xin (NAOC), Y. Wang (PMO,CAS; UCB), W. J. Xie (NAO,CAS), report on behalf of the SVOM mission team:\n\nWe observed the field of the short GRB 260504B detected by SVOM (Saccardi et al., GCN 44454) with the LCO 1m telescope at Cerro Tololo equipped with the Sinistro instrument.\n\nOur observation started on 2026-05-04 at 09:40:18 UT (about 9 min after the trigger) and we obtained 3x200 s exposures in the Pan-STARRS z filter.\n\nNo new source is detected within the ECLAIRs and MXT error circles, down to a limiting magnitude:\n\nz > 19.66 (AB, 5-sigma, mid-time 14.4 min after the SVOM trigger).\n\nThis value was calibrated against the SkyMapper survey DR4 and is not corrected for Galactic extinction.\n\nThis project is funded by the SVOM collaboration.\n",
  "format": "text/plain",
  "version": 3,
  "subject": "GRB 260504B: LCO z-band upper limit",
  "createdOn": 1777891086298,
  "submitter": "SVOM_group <svomgroup@bao.ac.cn>",
  "editedOn": 1778004186209,
  "eventId": "GRB 260504B",
  "editedBy": "Vidushi Sharma at NASA GSFC/UMBC <vidushi.sharma@nasa.gov> on behalf of Vidushi Sharma at NASA GSFC/UMBC <vidushi.sharma@nasa.gov>",
  "circularId": 44456,
  "submittedHow": "web"
}