{
  "submitter": "Alan Watson at UNAM <alan@astro.unam.mx>",
  "format": "text/plain",
  "bibcode": "2026GCN.44905....1W",
  "body": "Alan M. Watson (UNAM), Camila Angulo Valdez (UNAM), Rosa L. Becerra (UNAM), Nat Butler (ASU), Tsvetelina Dimitrova (ASU), William H. Lee (UNAM), and Margarita Pereyra (UNAM) report:\n\nWe observed the field of GRB 260610B (Fermi Team, GCN Circ. 44901) with the DDOTI wide-field imager at the Observatorio Astronómico Nacional on Sierra San Pedro Mártir from 2026-06-11 04:53 to 05:44 UTC (5.1 to 5.9 hours after the trigger) obtaining total exposure of 27 minutes.\n\nWe detect the candidate afterglow GOTO26fua/AT2026owq reported by O'Neill et al. (GCN Circ. 44903) with a preliminary AB magnitude of:\n\nw = 18.82 +/- 0.04\n\nCompared to the observations reported by O'Neill et al. at 0.21 hours, the candidate continues to fade and has an estimated temporal decay index of approximately −0.6, in agreement with that measured by O'Neill et al. between 0.21 and 1.4 hours.\n\nWe thank the staff of the Observatorio Astronómico Nacional on the Sierra of San Pedro Mártir.\n",
  "circularId": 44905,
  "eventId": "GRB 260610B",
  "submittedHow": "web",
  "subject": "GRB 260610B: DDOTI optical observations",
  "createdOn": 1781159475998
}