GRB 250419A: detection of the optical afterglow – 19 Apr. 2025

We detected the optical afterglow of GRB 250419A, about 37 hours after the burst.

GRB 250419A: 19 Apr. 2025.

On 19 April 2025 at 02:29:32 UT, SVOM/ECLAIRs triggered and located GRB 250419A. This detection was reported via the Nasa’s GCN 40168 Circular. Later, an optical afterglow was detected.

At 21:07 UTC, 18,6 hours after the burst, we remotely slewed the Celestron C14+Paramount ME+SBIG ST-10XME robotic unit  to the transient position, collecting 3, 300-second unfiltered exposures, then we averaged them. 

We clearly detected 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).

We published a GCN circular (GCN 40206).

Back to “Gamma Ray Burst” Page

Support The Virtual Telescope Project!

Support us! Please, donate and celebrate the ARTEMIS II mission with an EXCLUSIVE and STUNNING digital hi-res image of the largest Supermoon of 2025 to download and frame on your wall and many more pictures, specifically made for supporters like you!