{
  "bibcode": "2025GCN.41773....1R",
  "circularId": 41773,
  "subject": "EP250908C: GROND observation of the fading optical counterpart",
  "body": "Arne Rau (MPE) reports:\n\nWe observed the position of EP250908C (Zhang et al., GCN 41754) using the Gamma-Ray burst Optical Near-infrared Detector (GROND, Greiner et al. 2008) mounted to the MPG 2.2m telescope at ESO’s La Silla Observatory on 2025-09-10 07:24 UT, i.e. 31.5 hours after the Einstein Probe trigger.\n\nThe candidate optical counterpart reported by Malesani et al. (GCN 41760) was detected with\n\nr’= 23.0+/-0.2\ni’ = 22.8+/-0.2\n\nindicating clear fading. The magnitudes are in the AB magnitude system and calibrated against nearby SkyMapper sources.\n\nWe acknowledge the excellent support of the 2.2m staff, in particular Angel Hempel.\n",
  "submittedHow": "web",
  "submitter": "Arne Rau at MPE <arau@mpe.mpg.de>",
  "format": "text/plain",
  "createdOn": 1757494085493,
  "eventId": "EP250908c"
}