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.