{
  "createdOn": 1741694371270,
  "body": "Ichiro Takahashi (Science Tokyo), Kenta Taguchi (Kyoto U.), Seiji Toshikage, Masaomi Tanaka (Tohoku U.), Yousuke Utsumi (NAOJ), Ryosuke Itoh (Ibara City), Tomoki Morokuma (ARC/Chitech) report on behalf of a larger collaboration:\n\nWe performed optical imaging observations of the localization area of IceCube-250309A (GCN 39631) using the optical three-color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50-cm telescope Akeno and the Tricolor CMOS Camera and Spectrograph (TriCCS) on the 3.8-m Seimei telescope. We started our observations at UT 2025-03-09 14:29 (MITSuME) and 2025-03-09 16:53 (Seimei), about 6.9 and 9.3 hours after the event, respectively. The observations with MITSuME covered the 90% probability region with 4 pointings while the observations with Seimei covered about half of the 90% probability region with 15 pointings. The data reduction and detailed examination of the data are underway.\n",
  "subject": "IceCube-250309A: MITSuME Akeno and Seimei/TriCCS optical observations",
  "eventId": "IceCube-250309A",
  "format": "text/markdown",
  "submitter": "Ichiro Takahashi at Science Tokyo <itakahashi@hp.phys.titech.ac.jp>",
  "bibcode": "2025GCN.39666....1T",
  "circularId": 39666,
  "submittedHow": "web"
}