{
  "subject": "GRB 260708A: LCO further optical observations show supernova features",
  "createdOn": 1785808942092,
  "circularId": 45280,
  "eventId": "GRB 260708A",
  "eventType": [
    "GRB",
    "SN",
    "Optical Transient"
  ],
  "submittedHow": "web",
  "body": "Y.Y. Shi (GXU), C. Wu, L.P. Xin (NAOC), A. Saccardi, D. Turpin (CEA/Irfu), Y.X. Guan, S.J. Yin (GXU) report on behalf of the SVOM mission team:\n\n\nWe have continued monitoring the optical counterpart (Shilova et al., GCN 45123; Freeberg et al., GCN 45127; Sheng et al., GCN 45147) of the Fermi long GRB 260708A (Fermi/GBM Team, GCN 45115; Fermi-LAT, Holzmann Airasca et al., GCN 45117), using SINISTRO instruments mounted on 1-m telescopes of the LCO global network.\n\nWe observed the optical counterpart in imaging using the g, r, i bands from 2026-07-11 (3.56 days after the trigger) to 2026-08-02 (25.03 days after the trigger).\n\nThe optical counterpart shows a color change toward blue. It was measured to have a brightness of g=19.56+/-0.02 mag at 3.56 days post-trigger and g=18.88+/-0.02 mag at 11.48 days respectively, which show a rebrightening of the counterpart with a rise time of ~11.5 days post-trigger. Photometry was calibrated against the UCAC4 catalog, without template subtraction and not corrected for Galactic extinction.\n\nWe suggest that it is likely the supernova associated with the burst. Multi-band photometric and spectroscopic observations are encouraged.\n\nThis project is funded by the SVOM collaboration.",
  "bibcode": "2026GCN.45280....1S",
  "submitter": "SVOM_group <svomgroup@bao.ac.cn>",
  "format": "text/plain"
}