GCN Circular 38114

A. Rossi, E. Maiorano (INAF/OAS), D. B. Malesani (DAWN/NBI and Radboud Univ.), A. Melandri, D. Paris, and E. Marini (INAF-OAR), report on behalf of a larger collaboration: 

We observed the optical counterpart of GRB 241025A  (Ambrosi et al., GCN 37859
Not found
 
 
; Fermi GBM team, GCN 37860
Not found
 
 
; Wang et al., GCN 37863
Not found
 
 
; Li et al., GCN 37864
Not found
 
 
) with the LBC camera mounted on LBT (Mt. Graham, AZ, USA) in the r', i', and z' bands with approximate midtime 04:54:00 UT on 2024-10-28, or 3.14 days after the burst. Observations were performed under an average seeing of ~1.2" but with a few passing cirrus.

The optical afterglow (Ambrosi et al., GCN 37859
Not found
 
 
; Jiang et al., GCN 37862
Not found
 
 
; Pereyra et al., GCN 37865
Not found
 
 
; Xu et al., GCN 37866
Not found
 
 
; SVOM/VT team, GCN 37871
Not found
 
 
; Abdi et al., GCN 37882
Not found
 
 
; Watson et al., GCN 37889
Not found
 
 
; Mohan et al., GCN 37890
Not found
 
 
; Vinko et al., GCN 37891
Not found
 
 
; Gupta et al., GCN 37893
Not found
 
 
; Pankov et al., GCN 37912
Not found
 
 
; Moskvitin and Spiridonova, GCN 37914
Not found
 
 
 and 37923
Not found
 
 
; Klingler and Ambrosi, GCN 37919
Not found
 
 
; Wang et al., GCN 37926
Not found
 
 
) is well detected in all bands. We measure a preliminary AB magnitude of  

r' = 23.6+-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 and R. Ansaldi.