Abstract During the May 2024 super storm, we identified sub‐second microburst‐type relativistic electron precipitation events at McIlwain’s L∼2 $Lsim 2$ in low‐Earth orbit using the Gamma‐ray Burst Monitor (CGBM) onboard the CALorimetric Electron Telescope on the International Space Station. The high time resolution of CGBM (1/8 s) enables the detection of sub‐MeV electron microbursts that are unresolved by most currently available radiation belt monitors, which typically lack sub‐second cadence. Simultaneous plasma wave observations from the Arase satellite reveal enhanced whistler‐mode chorus activity at Roederer’s L∗∼2 ${L}^{ast }sim 2$–4. These observations indicate that chorus‐driven wave‐particle interactions can operate at unusually low L‐shells near the earthward‐displaced inner edge of the outer radiation belt during extreme geomagnetic storms. Quantifying whether such chorus activity also contributes to local acceleration or slot filling requires future evaluation of wave properties, plasma conditions, diffusion coefficients, and acceleration and loss timescales.