TITLE: GCN CIRCULAR NUMBER: 43260 SUBJECT: GRB 251230A: Optical Observations via Virtual Telescope Project, Italy DATE: 25/12/30 03:16:13 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 of GRB 251230A (Lanava et al., GCN 43252) with the 17” robotic unit available at the Virtual Telescope Project facility in Manciano, Italy, equipped with a KAF-6303E based CCD camera, its QE peaking (68%) in the red part of the spectrum. We collected four, 120-second unfiltered exposures, then we averaged them. The central time of the resulting stack was 30 Dec., 02:58:46 UTC, that is about 1.6 hours after the burst. We detected a bright object at the following position (J2000.0): R.A.: 11 59 35.38 Decl.: + 11 26 18.5 mean residuals < 0.1” on both axes R= 18.4 (assuming R-mags from Gaia DR2 for the reference stars). This position is consistent with Lanava et al. (GCN 43252), Li et al. (GCN 43255) and Busmann et al. (GCN 43258). View this GCN Circular online at https://gcn.nasa.gov/circulars/43260. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...