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Description
This work describes the response of the IceCube Neutrino Observatory and its successive extensions to low energy neutrinos from the core collapse of progenitor stars in the kpc range. IceCube detects such bursts not through individual event reconstruction, but through a collective rise in photomultiplier rates above the dark noise floor, a reach historically estimated using a single averaged module efficiency. The IceCube Upgrade, deployed during the 2025–26 polar season, introduces two structurally distinct sensors into this array, the mDOM and the D-Egg, making that averaged treatment insufficient for the extended detector. We present a Geant4 simulation reproducing the geometry and optical module properties with the addition of the IceCube Upgrade and planned Gen2 strings. Inverse beta decay positrons are propagated through a depth dependent Antarctic ice model, with Cherenkov photons tracked to the photocathode of each sensor. This work aims to determine how far the supernova sensitivity horizon can be pushed by the now in ice hardware, and what a mixed sensor array is actually capable of detecting.