• Corpus ID: 233872490

ZTF20aajnksq (AT2020blt): A Fast Optical Transient at $z \approx 2.9$ With No Detected Gamma-Ray Burst Counterpart

  title={ZTF20aajnksq (AT2020blt): A Fast Optical Transient at \$z \approx 2.9\$ With No Detected Gamma-Ray Burst Counterpart},
  author={Anna Y. Q. Ho and Daniel A. Perley and Paz Beniamini and S. Bradley Cenko and Shrinivas R. Kulkarni and Igor Andreoni and Leo P. Singer and Kishalay De and Mansi M. Kasliwal and Christoffer U. Fremling and Eric C. Bellm and Richard Dekany and Alexandre Delacroix and D. Duev and Daniel A. Goldstein and V. Zach Golkhou and Ariel Goobar and David D. S. Hale and Thomas Kupfer and Russ R. Laher and Frank J. Masci and A. A. Miller and James D. Neill and Reed L. Riddle and Ben Rusholme and David L. Shupe and Roger M. Smith and Jesper Sollerman and Jan van Roestel Caltech and Ljmu and Nasa Goddard and Umd and Dirac Institute and Coo and eScience Institute and Okc Physics and Kavli Institute Ucsb and Ipac and Ciera and Adler and Okc Astronomy},
We present ZTF20aajnksq (AT 2020blt), a fast-fading (∆r = 2.4 mag in ∆t = 1.3 d) red (g − r ≈ 0.6 mag) and luminous (M1626 = −25.9) optical transient at z = 2.9 discovered by the Zwicky Transient Facility (ZTF). AT 2020blt shares several features in common with afterglows to long-duration gamma-ray bursts (GRBs): (1) an optical light curve well-described by a broken power-law with a break at tj = 1 d (observerframe); (2) a luminous (LX = 10 46 erg s−1) X-ray counterpart; and (3) luminous (L… 

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