author={Daisuke Nakauchi and Kazumi Kashiyama and Hiroki Nagakura and Yudai Suwa and Takashi Nakamura},
  journal={The Astrophysical Journal},
We examine the bright radio synchrotron counterparts of low-luminosity gamma-ray bursts and relativistic supernovae (SNe) and find that they can be powered by spherical hypernova (HN) explosions. Our results imply that radio-bright HNe are driven by relativistic jets that are choked deep inside the progenitor stars or quasi-spherical magnetized winds from fast-rotating magnetars. We also consider the optical synchrotron counterparts of radio-bright HNe and show that they can be observed as… 

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