A tale of two GRB-SNe at a common redshift of z = 0.54

  title={A tale of two GRB-SNe at a common redshift of z = 0.54},
  author={Zach Cano and David Bersier and Cristiano Guidorzi and Raffaella Margutti and Karl M. Svensson and S. Kobayashi and A. Melandri and Klaas Wiersema and Alexei Pozanenko and A. van der Horst and Guy G. Pooley and Alberto Fern{\'a}ndez-Soto and Alberto J. Castro-Tirado and Antonio de Ugarte Postigo and M. Im and Atish Kamble and Devendra K. Sahu and J. Alonso-Lorite and G. C. Anupama and Joanne L. Bibby and Martin J. Burgdorf and Neil R. Clay and Peter A. Curran and Timur A. Fatkhullin and Andrew S. Fruchter and Peter M. Garnavich and Andreja Gomboc and Javier Gorosabel and John F. Graham and Uday K. Gurugubelli and Joshua B. Haislip and K. Y. Huang and Avon P. Huxor and Mansur A. Ibrahimov and Young Beom Jeon and Young Beom Jeon and Kevin M. Ivarsen and Daniel Kasen and E. V. Klunko and Chryssa Kouveliotou and Aaron Patrick Lacluyze and Andrew J. Levan and Vladimir M. Loznikov and Paolo A. Mazzali and Alexander S. Moskvitin and Christopher J. Mottram and C. G. Mundell and Peter E. Nugent and Melissa C. Nysewander and P. T. O’Brien and Won-Kee Park and V. Peris and Elena Pian and Daniel E. Reichart and James E. Rhoads and Evert Rol and Vasilij Rumyantsev and Victoria Scowcroft and David Shakhovskoy and Emma E. Small and R. J. Smith and Vladimir V. Sokolov and Rhaana L. C. Starling and Iain A. Steele and Richard G. Strom and Nial R. Tanvir and Yiannis Tsapras and Yuji Urata and Ovidiu Văduvescu and Alina A. Volnova and Alexandr Volvach and R. A. M. J. Wijers and S. E. Woosley and David R. Young},
  journal={Monthly Notices of the Royal Astronomical Society},
We present ground-based and Hubble Space Telescope optical observations of the optical transients (OTs) of long-duration Gamma Ray Bursts (GRBs) 060729 and 090618, both at a redshift of z= 0.54. For GRB 060729, bumps are seen in the optical light curves (LCs), and the late-time broad-band spectral energy distributions (SEDs) of the OT resemble those of local Type Ic supernovae (SNe). For GRB 090618, the dense sampling of our optical observations has allowed us to detect well-defined bumps in… 
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