TITLE: GCN CIRCULAR NUMBER: 41992 SUBJECT: GRB 250925A: Optical Observations via Virtual Telescope Project, Italy DATE: 25/09/26 00:08:38 GMT FROM: Gianluca Masi at Virtual Telescope Project <gianluca@bellatrixobservatory.org> Gianluca Masi, Virtual Telescope Project (Italy), reports: We attempted to observe the optical counterpart (Dichiara et al., GCN 41985) of GRB 250925A with the 14” robotic unit available at the Virtual Telescope Project facility in Manciano, Italy, equipped with a KAF-3200E based CCD camera, its QE peaking (90%) in the red part of the spectrum. We collected 9, 300-second unfiltered exposures, then we averaged them. The central time of the resulting stack was 25 Sept., 23:27 UTC, that is about 6.38 hours after the burst. We detected a faint object at the following position (J2000.0): RA: 22 44 51.32 Decl.: +46 33 20.7 R= 21.5 (assuming R-mags from Gaia DR2 for the reference stars). This position is consistent with Corcoran et al., GCN 41990 and Bochenek et al., GCN 41991 View this GCN Circular online at https://gcn.nasa.gov/circulars/41992. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...