The proto-black hole concept in GRB 101023 and its possible extension to GRB 110709B

From the spectral analysis and the light curve of GRB 101023, a clear evidence of two spectral components has been outlined. The first episode has been fit by a black body plus power law spectral model. The temperature changes with time following a broken power-law. The second episode appears to be a canonical GRB. Using the Amati and Atteia relations we determined the cosmological redshift to be z = 0:90:08 (stat.) 0:2(sys.). This source appears to be a twin of GRB 090618: the first episode has been defined as the proto-black hole and the second one presents the characteristics of a canonical GRB. We are exploring the possibility to extend these considerations to GRB 110709B. GRB 110709B has been detected by Konus Wind and Swift in gamma and X rays, and by Gemini and GROND telescopes in the optical bands. It is a very particular GRB, since Swift has triggered twice. Its light curve presents a two-episode structure, one that begins 40 s before the trigtime and lasts 100 s, and another that starts 485 s after the trigtime and lasts 380 s. This separation between the two episodes is the largest seen up to date.