iPTF14yb: The First Discovery of a Gamma-Ray Burst Afterglow Independent of a High-Energy Trigger

  title={iPTF14yb: The First Discovery of a Gamma-Ray Burst Afterglow Independent of a High-Energy Trigger},
  author={S. Bradley Cenko and Alexander L. Urban and Daniel A. Perley and Assaf Horesh and Alessandra Corsi and Derek B. Fox and Yi Cao and Mansi M. Kasliwal and A. Y. Lien and Iair Arcavi and Joshua S. Bloom and N. R. Butler and A. Cucchiara and Jos'e Antonio de Diego and Alexei V. Filippenko and Avishay Gal-yam and Neil Gehrels and Leonid N. Georgiev and J. J. Gonz{\'a}lez and John F. Graham and J. Greiner and David Alexander Kann and Christopher R. Klein and Fabian Knust and Shrinivas R. Kulkarni and Alexander S. Kutyrev and Russ R. Laher and William H. Lee and Peter E. Nugent and Jason Xavier Prochaska and Enrico Ramirez-Ruiz and Michael G. Richer and Adam Rubin and Yuji Urata and Karla Varela and A. M. Watson and Przemek R. Wozniak},
  journal={The Astrophysical Journal},
We report here the discovery by the Intermediate Palomar Transient Factory (iPTF) of iPTF14yb, a luminous (M_r ≈ 27.8 mag), cosmological (redshift 1.9733), rapidly fading optical transient. We demonstrate, based on probabilistic arguments and a comparison with the broader population, that iPTF14yb is the optical afterglow of the long-duration gamma-ray burst GRB 140226A. This marks the first unambiguous discovery of a GRB afterglow prior to (and thus entirely independent of) an associated high… 

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