{
  "subject": "EP250508a: KAIT optical upper limit",
  "body": "WeiKang Zheng (UCB), Xuhui Han (NAOC), Pinpin Zhang (NAOC) and\n\nAlexei V. Filippenko (UCB) report on behalf 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 EP250508a (Liang et al.,\n\nGCN 40390) starting at 06:17, May 08 UT, about 14 minutes after\n\nthe burst. A set of clear (roughly R) filter images were obtained.\n\nPreliminary analysis do not reveal any new optical counterpart\n\ncandidate within the X-ray afterglow error circles (Liang et al.,\n\nGCN 40390; Zhao et al., GCN 40399). Due to the bright moonlight,\n\nour image quality are degraded and we estimate the limiting\n\nmagnitude of our single image to be ~17.0 mag, shallower than the\n\nupper limit reported by other groups (Ugarte Postigo et al., GCN\n\n40391; Lipunov et al., GCN 40393; Brivio et al., GCN 40395).\n",
  "circularId": 40401,
  "eventId": "EP250508a",
  "submitter": "Weikang Zheng at UC Berkeley <weikang@berkeley.edu>",
  "bibcode": "2025GCN.40401....1Z",
  "createdOn": 1746729535020,
  "submittedHow": "email"
}