Cosmological Fast Optical Transients with the Zwicky Transient Facility: A Search for Dirty Fireballs

  title={Cosmological Fast Optical Transients with the Zwicky Transient Facility: A Search for Dirty Fireballs},
  author={Anna Y. Q. Ho and Daniel A. Perley and Yuhan Yao and Dmitry S. Svinkin and A. de Ugarte Postigo and Richard A. Perley and David Alexander Kann and Eric Burns and Igor Andreoni and Eric C. Bellm and Elisabetta Bissaldi and Joshua S. Bloom and Thomas G. Brink and Richard Dekany and Andrew J. Drake and Jos{\'e} Feliciano Ag{\"u}{\'i} Fern{\'a}ndez and Alexei V. Filippenko and Dmitry D. Frederiks and Matthew J. Graham and Boyan Hristov and Mansi M. Kasliwal and Shrinivas R. Kulkarni and Harsh Kumar and Russ R. Laher and Alexandra L. Lysenko and Bagrat G. Mailyan and Christian Malacaria and Adam A. Miller and S. Poolakkil and Reed L. Riddle and Anna Ridnaia and Ben Rusholme and V. Savchenko and Jesper Sollerman and Christina C. Th{\"o}ne and Anastasia Tsvetkova and Mikhail Ulanov and A. von Kienlin},
  journal={The Astrophysical Journal},
Dirty fireballs are a hypothesized class of relativistic massive-star explosions with an initial Lorentz factor Γinit below the Γinit ∼ 100 required to produce a long-duration gamma-ray burst (LGRB), but which could still produce optical emission resembling LGRB afterglows. Here we present the results of a search for on-axis optical afterglows using the Zwicky Transient Facility (ZTF). Our search yielded seven optical transients that resemble on-axis LGRB afterglows in terms of their red colors… 

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