{
  "subject": "GRB 260515A: LCO optical observations",
  "submitter": "SVOM_group <svomgroup@bao.ac.cn>",
  "submittedHow": "web",
  "eventId": "GRB 260515A",
  "createdOn": 1778890311644,
  "format": "text/plain",
  "body": "C. Wu (NAOC), A. Saccardi (CEA/Irfu), D. B. Malesani (DAWN/NBI and Radboud), report on behalf of the SVOM mission team:\n\nWe observed the field of the SVOM/ECLAIRs GRB 260515A (Brunet et al., GCN 44622) with the LCO 1m telescope at Teide Observatory equipped with the Sinistro instrument.\n\nOur observation started on 2026-05-15 at 22:42:33 UT (about 3.57 hr after the trigger) and we obtained 3x200 s exposures in the SDSS r and 3x200 s exposures in the Pan-STARRS z filters.\n\nThe optical counterpart (He et al., GCN 44623; Saccardi et al., GCN 44624; Sosnovskij et al., GCN 44625; He et al., GCN 44626) is faintly detected in our images. We measure the following magnitudes calibrated against the Pan-STARRS catalog, and not corrected for Galactic extinction:\n\nr = 21.22 +/- 0.09 AB (mid-time 4.44 hr after the trigger);\nz > 20.5 AB (3-sigma, mid-time 3.63 hr after the trigger).\n\nA marginal detection is recovered through forced photometry in the z band as well, to the level of z = 20.6 +/- 0.4 AB.\n\nThis project is funded by the SVOM collaboration.\n",
  "circularId": 44628,
  "bibcode": "2026GCN.44628....1W"
}