Abstract
Despite a generally accepted framework for describing the Gamma-Ray Burst
(GRB) afterglows, the nature of the compact object at the central engine and
the mechanism behind the prompt emission remain debated. The striped jet model
is a promising venue to connect the various GRB stages since it gives a robust
prediction for the relation of jet bulk acceleration, magnetization and
dissipation profile as a function of distance. Here, we use the constraints of
the magnetization and bulk Lorentz of the jet flow at the large scales where
the jet starts interacting with the ambient gas in a large sample of bursts to
(i) test the striped jet model for the GRB flow and (ii) study its predictions
for the prompt emission and the constraints on the nature of the central
engine. We find that the peak of the photospheric component of the emission
predicted by the model is in agreement with the observed prompt emission
spectra in the majority of the bursts in our sample, with a radiative
efficiency of about 10 per cent. Furthermore, we adopt two different approaches
to correlate the peak energies of the bursts with the type of central engine to
find that more bursts are compatible with a neutron star central engine
compared to a black hole one. Lastly, we conclude that the model favors broader
distribution of stripe length-scales which results in a more gradual
dissipation profile in comparison to the case where the jet stripes are
characterized by a single length-scale.