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[Shortened] Context: [...] we point out a striking similarity between GRB101023 and GRB 090618. We explore the possibility that these sources aremembers of a new GRB family related to a single core-collapse. We use thisunderstanding of the source in order to infer the unobserved redshift of GRB101023. [...]. Aims: In precise analogy with GRB 090618 we aim to analyze the89s of emission of GRB 101023 to see if we are in presence of two differentepisodes: the first one presenting a characteristic Black-body temperatureevolution, evolving in time with a broken power-law, and the second oneconsistent with a canonical GRB. [...] Results: We confirm that the firstepisode can be well fit by a Black body plus a power-law model. The temperaturechanges with time following a broken power law, and the photon index of thepower-law component presents a soft to hard evolution. We estimate the radiusof this source, increasing with time with a velocity of 1.5x10^4 km/s. Thesecond episode appears to be a canonical GRB. By using the Amati relation andthe Atteia relation, we determine the cosmological redshift, z ~ 0.9 +- 0.084(stat.) +- 0.2 (sys.). [...]. Particularly striking is the scaling law of thesoft X-ray component of the afterglow. Conclusions: We identify GRB 090618 andGRB 101023 with a new family of GRBs presenting a double astrophysicalcomponent. A first one, related to the proto-black hole, prior to the processof gravitational collapse (episode 1) and a second one which is the canonicalGRB (episode 2) emitted during the formation of the black-hole. [...] Thisanalysis indicates progress towards developing a GRB distance indicator basedon the understanding of the P-GRB and the prompt radiation as well as the softX-Ray behavior of the late afterglow.

Evidence for a proto-black hole and a double astrophysical component in GRB 101023