  Gamma-ray bursts (GRB) are the most intense electromagnetic (EM) sources in
the Universe. Long GRB (LGRB) correspond to those events with a typical prompt
emission of more than a few seconds. It is generally assumed that they are
originated after an implosion of a very massive star within a central compact
object engine that can be either a black hole (BH) or a rapidly-spinning
highly-magnetized neutron star (NS). Nevertheless, one of the most challenging
aspects of defining a unique model is that the progenitor remains initially
hidden for direct EM observation. In this work, we investigate the evolution of
thermally-produced neutrino properties in both GRB progenitors to provide an
alternative solution. We consider the characteristics of both progenitors and
the fireball scenario to calculate the oscillation probabilities within a
three-flavor admixture regime. Then we obtain the expected neutrino ratio and
we also estimate the number of events from these sources that could be detected
in the future Hyper-Kamiokande (Hyper-K) detector, considering a sample of
previously observed GRB with remarkably signs of being magnetar-produced. Our
findings indicate that examining the predicted neutrino rates result in an
additional mechanism to determine the type of progenitor associated with these
events. This is especially useful when, for instance, we cannot directly
observe an electromagnetic counterpart, such as so-called "failed" GRB with
hidden jets, or when light curve analysis is inconclusive.
