This study investigates the energy spectrum of electron microbursts observed by Focused Investigations Relativistic Electron Burst Intensity, Range, and Dynamics II (FIREBIRD-II, henceforth FIREBIRD) CubeSats. FIREBIRD is a pair CubeSats, launched in January 2015 into low Earth orbit, which focuses on studying microbursts. High-resolution data from FIREBIRD-II consist 5 differential channels be...