{
  "subject": "EP250321a: KAIT optical observations",
  "circularId": 39832,
  "submittedHow": "email",
  "eventId": "EP250321a",
  "createdOn": 1742622989936,
  "bibcode": "2025GCN.39832....1Z",
  "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, automatically responded to EP250321a detected\n\nby Einstein Probe (Hu et al., GCN 39800) starting at 07:05:35 UT,\n\nabout 0.93 hours after the trigger and lasted for ~4 hours. A set\n\nof 60s exposure images were obtained in the clear (roughly R)\n\nfilters. We detect the optical afterglow (Fu et al., GCN 39804;\n\nPerez-Garcia et al al., GCN 39805; Brivio et al., GCN 39807;\n\nZhu et al., GCN 39809; Becerra et al., GCN 39810; Pérez-Fournon\n\net al., GCN 39812; Lee et al., GCN 39815; Ghosh et al., GCN 39816;\n\nHan et al., GCN 39817; Jin et al., GCN 39822; Zhu et al., GCN 39827;\n\nGill et al., GCN 39831) with a mag of 18.7 +/- 0.2 (Vega) at 0.93\n\nhours, it decayed to ~20.7 +/- 0.3 mag at ~5.4ks. The OT started\n\ngetting brighter slowly and reach a peak of ~19.5 +/- 0.2 mag\n\naround 9.5ks, then decayed after that.\n",
  "submitter": "Weikang Zheng at UC Berkeley <weikang@berkeley.edu>"
}