Evidences for a double component in the emission of GRB 101023

A.V. PENACCHIONI; A. V. PENACCHIONI 1,3, R. RUFFINI1,2, C. L. BIANCO1,2, L. IZZO1, M. MUCCINO1, G. B. PISANI1,3 AND J. A. RUEDA1,2; L. IZZO; M. MUCCINO; C.L. BIANCO; L. CAITO; B. PATRICELLI

Memorie della Societa Italiana Supplement

Fabrizio Serra

Lugar: Pisa-Roma; Año: 2012 vol. 21 p. 230 - 234

0037-8720

We present the results of a preliminar analysis of GRB 101023 in the fireshell scenario [1]. Its redshift has not been determined due to the lack of optical data, so we tried to infer it applying two different methods, following two different works by Amati et al. and Grupe et al. Its light curve presents a double emission, which makes it very similar to the already studied GRB 090618. We called each part episode 1 and 2, respectively. We performed a time-resolved spectral analysis with RMFIT and XSPEC using different spectral models, and fitted the light curve with a numerical code. We used Fermi GBM data [3] to build the light curve, in particular the second and fifth NaI detectors, in the range (8.5- 1000 keV). We considered different hypothesis regarding which part of the light curve could be the GRB and performed the analysis to all of them. We noticed a great variation of the temperature with time in the first episode, as well as almost no variation of the progenitor radius. We concluded that the second episode perfectly agrees with being a canonical GRB, with a P-GRB lasting 4s, while the first episode does not match the fireshell requirements for a GRB. Indeed, as we concluded within the fireshell scenario, it makes reference to the early stages of the formation of a black hole, as the core of the progenitor collapses.