TITLE: GCN CIRCULAR NUMBER: 41773 SUBJECT: EP250908C: GROND observation of the fading optical counterpart DATE: 25/09/10 08:48:05 GMT FROM: Arne Rau at MPE <arau@mpe.mpg.de> Arne Rau (MPE) reports: We 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. The candidate optical counterpart reported by Malesani et al. (GCN 41760) was detected with r’= 23.0+/-0.2 i’ = 22.8+/-0.2 indicating clear fading. The magnitudes are in the AB magnitude system and calibrated against nearby SkyMapper sources. We acknowledge the excellent support of the 2.2m staff, in particular Angel Hempel. View this GCN Circular online at https://gcn.nasa.gov/circulars/41773. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...