{
  "circularId": 46271,
  "subject": "GRB 261113A: Ondrejov D50 optical observations",
  "body": "M. Jelinek, J. Strobl, F. Novotny and R. Hudec (ASU CAS Ondrejov) report:\n\nWe observed the optical afterglow of the SVOM/ECLAIRs GRB 261113A (Saccardi\net al., GCN 46244; Lin et al., GCN 46247) with the D50 telescope of the\nAstronomical Institute Ondrejov, near Prague, Czech Republic. Our\nobservations started at 16:48 UT on 2026 November 13, i.e. ~2.3 h after the\ntrigger, and continued until 22:17 UT, cycling through the SDSS r, g and\ni filters.\n\nThe afterglow is detected in all filters. In the first combined r-band\nimage (mean time ~2.7 h after the trigger) we measure r = 20.51 +/- 0.09\n(AB, calibrated against ATLAS-RefCat2, not corrected for Galactic\nextinction).\n\nOur multicolour sequence follows the afterglow decay up to ~7.8 h after\nthe trigger. The analysis is ongoing.\n\n",
  "createdOn": 1794659130950,
  "submittedHow": "email",
  "submitter": "Martin Jelinek at Astro.Inst-AVCR,Ondrejov <martin.jelinek@asu.cas.cz>",
  "eventId": "GRB 261113A"
}