{
  "eventId": "GRB 260924A",
  "submitter": "Filip Novotný at Masaryk University <filip.novotny@talentovani.cz>",
  "format": "text/plain",
  "body": "F. Novotny, J. Strobl, M. Jelinek and R. Hudec (ASU CAS Ondrejov) report:\n\nWe observed the position of GRB 260924A (D'Elia et al., GCN 45713;\nEvans et al., GCN 45715), detected by Swift (trigger=1513082), with the\nD50 telescope of the Astronomical Institute Ondrejov, near Prague, Czech\nRepublic. We obtained 14x120s and 10x60s Sloan r'-band exposures between\n03:15 and 03:57 UT on 2026 September 25, i.e. 26.0-26.7 h after the\ntrigger.\n\nThe optical afterglow (Hu et al., GCN 45717; Izzo et al., GCN 45718)\nis detected in the combined image (mean epoch T0+26.4 h) at\nRA, Dec = 08:55:03.11, +12:02:35.5 (J2000), consistent with the UVOT\nposition (Klingler et al., GCN 45735), with a magnitude of\n\nr' = 19.12 +/- 0.08 (AB)\n\nPhotometry is calibrated in Sloan r' (AB system) against ATLAS-RefCat2\nfield stars, not corrected for Galactic extinction (E(B-V)=0.041 mag).",
  "eventType": [
    "GRB",
    "Afterglow",
    "Optical Transient"
  ],
  "submittedHow": "web",
  "circularId": 45743,
  "subject": "GRB 260924A: Ondrejov D50 optical afterglow detection",
  "createdOn": 1790338006394
}