{
  "circularId": 41380,
  "submittedHow": "email",
  "eventId": "GRB 250814A",
  "createdOn": 1755210647001,
  "bibcode": "2025GCN.41380....1Z",
  "subject": "GRB 250814A: KAIT optical upper limit",
  "body": "WeiKang Zheng (UCB) and Alexei V. Filippenko (UCB) report on\n\nbehalf of the KAIT GRB team:\n\n\nThe 0.76-m Katzman Automatic Imaging Telescope (KAIT), located at\n\nLick Observatory, observed the field of GRB 250814A (Fermi GBM\n\nteam, GCN 41357; Caputo et al., GCN 41358) starting at 07:50:38,\n\nAug. 14 UT, 939 seconds after the burst. A set of 120x60s clear\n\n(roughly R) filter images were obtained. Preliminary analysis\n\ndo not reveal any new optical counterpart candidate within the\n\nSwift/XRT error circles (Caputo et al., GCN 41358), neither in\n\nsingle image, nor in the co-add images. Also no object was found\n\nat the afterglow candidate position reported by Karambelkar et al.\n\n(GCN 41377). Our upper limit is about 21.5 (Vega) mag at a mid\n\ntime of 1.27 hours after the burst. Our result is consistent with\n\nthe upper limit reported by other groups (Becerra et al., GCN 41362;\n\nPostigo et al., GCN 41367; Karambelkar et al., GCN 41372; Salazar\n\net al., GCN 41375).\n",
  "submitter": "Weikang Zheng at UC Berkeley <weikang@berkeley.edu>"
}