{
  "body": "Asia deGraw, Gracelynn Jost, WeiKang Zheng and Alexei V. Filippenko\n\n(UC Berkeley) report on behalf of the KAIT GRB team:\n\n\nThe 0.76-m Katzman Automatic Imaging Telescope (KAIT), located at\n\nLick Observatory, continued the observation of GRB 250407A optical\n\nafterglow (Zheng et al., GCN 40116; Ducoin et. al, GCN 40117;\n\nPérez-Fournon et. al, GCN 40125; Pankov et al., GCN 40133) at\n\n03:35 UT, Apr. 09, namely ~1.55 days after burst. A set of clear\n\n(roughly R) filter images were obtained. Compared to our earlier\n\nobservations (Zheng et al., GCN 40116), the reported afterglow had\n\nfaded to ~20.8 +/- 0.3 mag (Vega) measured in our coadd image.\n\n\nAdditional R band images with 600sx5 exposure were obtained with the\n\n1-m Nickel telescopes located at Lick observatory, starting at ~1.55\n\ndays after burst. We measure the brightness of R ~ 21.0 +/- 0.2 mag\n\n(Vega), similar to the R band magnitude reported by Pankov et al.\n\n(GCN 40133) at a slightly later epoch (1.98 days), suggesting that\n\nthis might be the host galaxy of GRB 250407A as suggested by Ducoin\n\net. al, GCN 40117).\n",
  "eventId": "GRB 250407A",
  "createdOn": 1744356386239,
  "submitter": "Weikang Zheng at UC Berkeley <weikang@berkeley.edu>",
  "bibcode": "2025GCN.40135....1D",
  "subject": "GRB 250407A: Continued KAIT/Nickel optical observations",
  "circularId": 40135,
  "submittedHow": "email"
}