2025ApJ...994...91O

The physical origin of prompt emission in gamma-ray bursts (GRBs) remains an open question since it has been studied for more than half a century. Three alternative models (i.e., dissipative photosphere, internal shock, and Internal-Collision-induced MAgnetic Reconnection and Turbulence, ICMART) have been proposed to interpret the observations of GRB prompt emission, but none of them can fully interpret all of the observational data collected so far. The question is what is the fraction of these three theoretical models in the prompt emission of GRBs. In this paper, we propose to utilize an innovative method and constrain the fraction of GRB prompt emission models via its nondetected diffuse neutrinos. By adopting two methods (e.g., summing up the individual GRB contributions and assumed luminosity functions of GRB) to calculate diffuse neutrino flux of GRBs for given the benchmark parameters of Γ = 300 and ε_p/ε_e = 10, both approaches indicate that most GRBs should be originated from the ICMART model. Moreover, we find that the fractions of the dissipative photosphere model, the internal shock model, and the ICMART model are constrained to be [0, 0.5%], [0, 1.1%], and [98.9%, 1], respectively, for the method of summing up the individual GRB contributions. For the method of luminosity functions, the fractions of above three models are constrained to be [0, 6.1%], [0, 8.2%], and [91.8%, 1], respectively. However, such fractions of different models are also dependent on the parameters of Γ and ε_p/ε_e.