GCN Circular 46021
Subject
EP261015a: VST optical observations
Event
Date
2026-10-24T17:04:27Z (4 days ago)
From
luca.izzo@inaf.it
Via
Web form
L. Izzo (INAF-OACn and DARK/NBI) reports on behalf of a larger collaboration:
We observed the field of EP261015A (Li et al., GCN Circular #45956) with the OmegaCAM imager mounted on the 2.6-m VLT Survey Telescope (VST) at Cerro Paranal, Chile. Observations began on 2026 October 22 at 07:06 UT, 6.74 days after the EP trigger. We obtained five 300-s exposures in each of the SDSS g and r filters.
The optical counterpart reported by multiple facilities (Corcoran et al., GCNs #45955 and #45972; Li et al., GCNs #45956 and #45969; Méndez et al., GCN #45960; Ma et al., GCN #45963; Mohan et al., GCN #45967; Fortin et al., GCN #45991; Volnova et al., GCN #45997; Pawar et al., GCNs #45998 and GCN #46006; Shivaprasad et al., GCN #46000; Pankov et al., GCN #46003; Gou et al., GCN #46009; Burkhonov et al., GCN #46017) is clearly visible in both stacked images. We measure preliminary magnitudes of g = 23.18 +/- 0.22 mag (AB) and r = 21.99 +/- 0.09 (AB), calibrated against nearby stars from the Pan-STARRS catalog.