{
  "createdOn": 1793050048417,
  "eventType": [
    "GRB",
    "Optical Transient"
  ],
  "submitter": "Filip Novotný at Masaryk University <filip.novotny@talentovani.cz>",
  "subject": "GRB 261026A: Ondrejov D50 optical limit",
  "format": "text/plain",
  "circularId": 46049,
  "eventId": "GRB 261026A",
  "submittedHow": "web",
  "body": "F. Novotny, J. Strobl, M. Jelinek and R. Hudec (ASU CAS Ondrejov) report:\n\nWe observed the position of GRB 261026A, detected by SVOM/ECLAIRs and\nSVOM/GRM (Goto et al., GCN 46030), with the D50 telescope of the\nAstronomical Institute Ondrejov, near Prague, Czech Republic. We obtained\na series of 60s Sloan i'-band exposures between 17:05 and 20:58 UT on\n2026 October 26, i.e. 10.9-14.8 h after the trigger. Part of the series\nwas affected by clouds; 192 frames with good transparency were combined.\n\nWe do not detect the optical counterpart at the SVOM/VT position\n(RA, Dec = 337.35317, +27.02623; Wu et al., GCN 46035), neither in single\nimages (3-sigma limit i'>17.3-18.8) nor in the combined 11520 s image\n(mean epoch T0+13.13 h, 3-sigma limit i'>20.6).\n\nPhotometry is calibrated in Sloan i' (AB system) against ATLAS-RefCat2\nfield stars, not corrected for Galactic extinction."
}