GCN Circular 37969
Subject
GRB 241026A: LBT optical observations
Event
Date
2024-10-30T13:30:41Z (8 months ago)
From
Andrea Rossi at INAF <andrea.rossi@inaf.it>
Via
Web form
A. Rossi, E. Maiorano (INAF/OAS), D. B. Malesani (DAWN/NBI and Radboud Univ.), L. Izzo (INAF/OAC), and V. D'Elia (ASI/SSDC & INAF-OAR) report on behalf of the CIBO collaboration:
We observed the optical counterpart of GRB 241026A (Melandri et al., GCN 37896; Trigg, GCN 37917; Zhang et al., GCN 37921 and GCN 37924; Pal et al., GCN 37929) with the LBC camera mounted on LBT (Mt. Graham, AZ, USA) in the g’, r’, i ’, and z’ bands (12 min exposure time per filter) with approximate midtime 03:35:00 UT on 2024-10-28, or 1.20 days after the burst. Observations were performed under an average seeing of ~1" but with a few passing cirrus.
The optical afterglow (Moskvitin et al., GCNs 37899, 37916, 37922; Watson et al., GCN 37900; Zheng & Filippenko GCN 37903; Shrestha et al., GCN 37913; Mo et al., GCN 37915; Mohan et al., GCN 37918; Izzo et al., GCN 37925; Wang et al., GCN 37928) is well detected in all bands. We measure a preliminary AB magnitude of
r' = 21.4+-0.1,
calibrated against Pan-STARRS field stars, and not corrected for the foreground Galactic extinction.
We acknowledge excellent support from the LBTO and LBT-INAF staff, particularly O. Kuhn, R. Ansaldi, D. Paris and E. Marini.