A Unified Framework for 10 TeV to EeV Diffuse Neutrino Sky and KM3-230213A

Establishing a unified framework that simultaneously accounts for the wideband diffuse neutrino flux and the physical origin of individual ultrahigh-energy (UHE) neutrino detections, including KM3-230213A, remains a pressing challenge in multimessenger astrophysics. In intrinsically low-luminosity gamma-ray bursts (LL GRBs) driven by shock breakouts (SBOs), the evolving physical conditions naturally produce a multicomponent neutrino flux extending from 10 TeV to the EeV scale. By integrating prompt and afterglow phases within a unified framework grounded in multiwavelength observations of representative events, we show that LL GRB population accounts for this broadband neutrino emission through a characteristic two-hump spectrum. In this framework, the prompt emission from GRB 060218-like events accounts for ≳10% of the diffuse flux at 100 TeV, while GRB 100316D-like afterglow configuration predicts a distinct flux peak near 10 −9 GeV cm −2 s −1 sr −1 at 100 PeV. This two-hump spectrum provides a high-energy component flux consistent with the 220 PeV KM3-230213A event, while the low-energy component contributes non-trivially to the observed diffuse neutrinos and supports the lack of individual low-energy counterparts. Furthermore, we utilize Fermi-LAT gamma-ray upper limits to place constraints on the source distance and luminosity of the event, assuming a GRB 100316D-like afterglow configuration. Ultimately, this framework identifies SBO-like LL GRBs as a unifying origin for these phenomena, providing a physical link across the 10 TeV to EeV neutrino sky that is testable by next-generation observatories, including GRAND, IceCube-Gen2, and RNO-G.