TITLE: GCN CIRCULAR NUMBER: 40206 SUBJECT: GRB 250419A: Optical Observations via Virtual Telescope Project DATE: 25/04/22 13:17:41 GMT FROM: Gianluca Masi at Virtual Telescope Project gianluca@bellatrixobservatory.org

Gianluca Masi, Virtual Telescope Project (Italy), reports:

We observed the field of GRB 250419A (Wang et al., GCN 40168) with the 14” robotic unit available at the Virtual Telescope Project facility in Manciano, Italy, equipped with a KAF-3200E based CCD camera.

We collected 3, 300-second unfiltered exposures, then we averaged them. The central time of the resulting stack was 19 April, 21:07 UTC, that is about 18.6 hours after the burst.

We clearly detect the optical counterpart of GRB 250419A.

The position of the source is RA: 13 29 37.26; Decl.: +07 02 28.0 (J2000.0, mean residuals of 0.05”, reference stars from GaiaDR2) and the magnitude was estimated to be 19.3 (SNR=12, assuming R mags for the reference stars from GaiaDR2).

The image is available here: https://www.virtualtelescope.eu/2025/04/22/grb-250419a-detection-of-the-opti...

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