A common behavior in the late X-ray afterglow of energetic GRB-SN   systems
  The possibility to divide GRBs in different subclasses allow to understand better the physics underlying their emission mechanisms and progenitors. The induced gravitational collapse scenario proposes a binary progenitor to explain the time-sequence in GRBs-SNe. We show the existence of a common behavior of the late decay of the X-ray afterglow emission of this subclass of GRBs, pointing to a common physical mechanism of their late emission, consistent with the IGC picture. 
L. Izzo, G. B. Pisani, M. Muccino, J. A. Rueda, Y. Wang, C. L. Bianco,   A. V. Penacchioni, R. Ruffini
astro-ph.HE astro-ph.CO