{
  "body": "Viraj Karambelkar (Caltech), Mansi Kasliwal (Caltech), Steven Giacalone\n(Caltech), Emily Gilbert (IPAC), Matt Lastovka (UMD), Vishwajeet Swain\n(IITB), Gaurav Waratkar (IITB), Tomas Ahumada (Caltech) report:\n\nWe observed the field of the Fermi and Swift GRB 250814A (Fermi team, GCN\nCirc. 41357, Caputo et al. GCN  Circ. 41358) coincident with the\nsub-threshold GW trigger S250814bg (GCN Circ. 41364) in the near-infrared J\nand Ks bands with the Wide-field infrared Camera (WIRC, Wilson et al. 2003)\non the Palomar 200-inch telescope. Observations started on 2025-08-14 at\n11:31:29 UT and lasted for 1665 seconds in the J-band, and started at\n12:09:12 UT and lasted for 810 seconds in the Ks-band.\n\nWe marginally detect a faint source in the Ks-band image at RA=20:25:13.9,\nDec=48:23:55.9 (J2000), ~0.6 arcsec from the enhanced position of the X-ray\ncounterpart reported by Caputo et al (GCN 41358). We also detect a marginal\nsource at this location in the more sensitive J-band image, however, it is\nblended with several faint sources and is near the detection limit of the\nimage. We performed aperture photometry at the location of this source and\nmeasured the following magnitudes\n\nKs ~ 21.2 +/- 0.35 mag (AB),\n\nJ ~ 21.6 mag +/- 0.4 mag (AB)\n\nWe encourage deep NIR observations to trace the brightness evolution and\nconfirm the nature of this source.\n",
  "subject": "GRB 250814A: Possible afterglow candidate from P200/WIRC",
  "createdOn": 1755200132433,
  "submitter": "Viraj Karambelkar at Indian Inst of Tech,Bombay <karambelkarvraj21197@gmail.com>",
  "circularId": 41377,
  "bibcode": "2025GCN.41377....1K",
  "submittedHow": "email",
  "eventId": "GRB 250814A"
}