GRB 240910A: NOT optical observations

We observed the optical counterpart (Julakanti et al., GCN 37459; Jiang et al., GCN 37460; D'Ai et al., GCN 37461) of GRB 240910A (Fermi GBM team, GCN 37441; Zhang et al., GCN 37445) using the Nordic Optical Telescope (NOT) located in the Canary Islands. Observations began at high airmass, as soon as the target became observable. In a 300 s image taken in the r band with mean time Sep 11.98 UT (1.425 days after the trigger), we measure for the optical counterpart a magnitude r = 21.4 +- 0.1 AB, calibrated against nearby Pan-STARRS objects.