{
  "eventType": [
    "GRB"
  ],
  "format": "text/markdown",
  "submitter": "Geoffrey Mo at Caltech / Carnegie Observatories <gmo@mit.edu>",
  "eventId": "GRB 260924A",
  "createdOn": 1790442218726,
  "subject": "GRB 260924A: Near-infrared detection with MDM/MIRAGE",
  "submittedHow": "web",
  "body": "Geoffrey Mo (Carnegie/Caltech), K. De, V. Karambelkar, S. Ibrahim, D. Schiminovich (Columbia University) report:\n\nWe observed the field of GRB 260924A (Fermi GBM Team, GCN 45712; D'Elia et al., GCN 45713; Evans et al., GCN 45715; Salunke et al., GCN 45720; Holzmann Airasca et al., GCN 45721; McDermott et al., GCN 45723; Dichiara et al., GCN 45730; Waratkar et al., GCN 45732; Gupta et al., GCN 45733; Vijaykumar et al., GCN 45734; Yu et al., GCN 45741; Gupta et al., GCN 45750; Ridnaia et al., GCN 45751) in the near-infrared J and Hs bands with the MDM InfraRed Astronomy inGaas Experiment (MIRAGE) instrument on the MDM 1.3 m telescope.\n\nObservations began at 2026-09-26T12:08:38 (+2.46 days after the GRB trigger) in the J band and 2026-09-26T12:32:07 (+2.47 days) in the Hs band, lasting 1080 s in J and 1050 s in Hs. We detect the optical counterpart (Hu et al., GCN 45717; Izzo et al., GCN 45718; Klingler et al., GCN 45735; Ma et al., GCN 45736; Castro-Tirado et al., GCN 45740; Novotny et al., GCN 45743; Aryan et al., GCN 45748; Li et al., GCN 45758; Fortin et al., GCN 45759) in the J band and set an upper limit in Hs, with the following AB magnitudes: J = 19.81 ± 0.20, Hs > 19.2.\n\nMIRAGE is a new robotic YJHs-band near-infrared imager for the MDM 1.3m telescope. We thank the Mt Cuba Astronomical Foundation for development of MIRAGE and the MDM Observatory staff for supporting the observations.\n",
  "circularId": 45762
}