The Type Ic Supernovae associated with Gamma Ray Bursts show very broad absorption lines in the early phase. Other SNe Ic share this property but are not apparently linked to a GRB. Synthetic spectra in both the early and the late phase can be used to constrain the properties of these SNe and bear indications that the explosions are aspherical, providing a natural link between Hypernovae and Gamma Ray Bursts.
P. A. Mazzali, Koji S. Kawabata, Keiichi Maeda, K. Nomoto, Alexei V Filippenko, E. Ramírez-Ruiz, S. Benetti, E. Pian, Jinsong Deng, Nozomu Tominaga, Youichi Ohyama, Masanori Iye, R. J. Foley, T. Matheson, Lifan Wang, A. Gal‐Yam
Keiichi Maeda, Koji S. Kawabata, P. A. Mazzali, Masaomi Tanaka, S. Valenti, K. Nomoto, Takashi Hattori, Jinsong Deng, E. Pian, S. Taubenberger, Masanori Iye, T. Matheson, Alexei V Filippenko, Kentaro Aoki, George Kosugi, Youichi Ohyama, Toshiyuki Sasaki, Tadafumi Takata
Keiichi Maeda, Koji S. Kawabata, P. A. Mazzali, Masaomi Tanaka, S. Valenti, K. Nomoto, Takashi Hattori, Jinsong Deng, E. Pian, S. Taubenberger, Masanori Iye, T. Matheson, Alexei V Filippenko, Kentaro Aoki, George Kosugi, Youichi Ohyama, Toshiyuki Sasaki, Tadafumi Takata
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