TITLE:   GCN CIRCULAR
NUMBER:  37734
SUBJECT: GRB 240910A: LBT optical observations 
DATE:    24/10/08 12:52:51 GMT
FROM:    Andrea Rossi at INAF <andrea.rossi@inaf.it>

A. Rossi, E. Maiorano (INAF-OAS), and D. B. Malesani (DAWN/NBI and Radboud Univ.), report on behalf of the CIBO collaboration:

We observed the field of GRB 240910A (Zhang et al. GCN 37445; Ripa et al. GCN 37450; Godwin, GCN 37464) with the LBC camera mounted on LBT (Mt. Graham, AZ, USA) in r’ and z’ bands (15 min exposure time per filter) approximately at midtime 06:20:00 UT on 2024-09-26 (16.1 days after the burst). Observations were performed under mediocre weather conditions and an average seeing of ~1.7".

At the location of the afterglow  (Julakanti et al. GCN 37459; Jiang et al. GCN 37460; D’Ai et al. GCN 37461; Malesani et al. GCN 37463; Qiu et al. GCN 37503; Evans et al., GCN 37553; Giarratana et al., GCN 37569) we detect a faint source with the following AB magnitudes:

r’ = 26.1 +- 0.4,
z' > 24.4,

calibrated against SDSS field stars, and not corrected for foreground Galactic extinction.

We acknowledge the excellent support from the LBTO and LBT-INAF staff, particularly F. Cusano and D.Paris in obtaining these observations.