{
  "createdOn": 1744090869222,
  "submittedHow": "email",
  "eventId": "GRB 250407A",
  "submitter": "Weikang Zheng at UC Berkeley <weikang@berkeley.edu>",
  "bibcode": "2025GCN.40116....1Z",
  "body": "WeiKang Zheng and Alexei V. Filippenko (UC Berkeley) report on\n\nbehalf of the KAIT GRB team:\n\nThe 0.76-m Katzman Automatic Imaging Telescope (KAIT), located at\n\nLick Observatory, observed the field of GRB 250407A (GBM team,\n\nGCN 40104; Preis et al., GCN 40105; Mukherjee et al., GCN 40114)\n\naround the X-ray afterglow location (Molkov et al., GCN 40110;\n\nDichiara et al., GCN 40113) starting at 04:17, Apr. 08 UT, about\n\n12.48 hours after the burst. A set of clear (roughly R) filter\n\nimages were obtained. Within the XRT afterglow (Dichiara et al.,\n\nGCN 40113) error circle, we detected an uncataloged optical\n\nafterglow candidate at J2000 position of (error ~0.5\"):\n\nRA:  07:23:02.11\n\nDec: +36:47:54.97\n\nWe estimate the clear band magnitude to be ~20.1 +/- 0.3 mag (Vega)\n\nat 12.48 hours after the burst. Further observations are encouraged.\n",
  "subject": "GRB 250407A: KAIT Optical Afterglow Candidate",
  "circularId": 40116
}