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  • Ho, Anna Y. Q. (author)

ZTF20aajnksq (AT 2020blt) : A Fast Optical Transient at z ≈ 2.9 with No Detected Gamma-Ray Burst Counterpart

  • Article/chapterEnglish2020

Publisher, publication year, extent ...

  • 2020-12-17
  • American Astronomical Society,2020
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:su-189183
  • https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-189183URI
  • https://doi.org/10.3847/1538-4357/abc34dDOI

Supplementary language notes

  • Language:English
  • Summary in:English

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  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • We present ZTF20aajnksq (AT 2020blt), a fast-fading (Delta r = 2.3 mag in Delta t = 1.3 days) red (g - r 0.6 mag) and luminous (M-1626 A = -25.9 mag) 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 t(j) = 1 d (observer frame); (2) a luminous (L0.3-10 KeV = 10(46) erg s(-1)) X-ray counterpart; and (3) luminous (L-10 GHz = 4 x 10(31) erg s(-1) Hz(-1)) radio emission. However, no GRB was detected in the 0.74 days between the last ZTF nondetection (r > 21.36 mag) and the first ZTF detection (r = 19.60 mag), with an upper limit on the isotropic-equivalent gamma-ray energy release of E-gamma,E-iso < 7 x 10(52) erg. AT 2020blt is thus the third afterglow-like transient discovered without a detected GRB counterpart (after PTF11agg and ZTF19abvizsw) and the second (after ZTF19abvizsw) with a redshift measurement. We conclude that the properties of AT 2020blt are consistent with a classical (initial Lorentz factor Gamma(0) greater than or similar to 100) on-axis GRB that was missed by high-energy satellites. Furthermore, by estimating the rate of transients with light curves similar to that of AT 2020blt in ZTF high-cadence data, we agree with previous results that there is no evidence for an afterglow-like phenomenon that is significantly more common than classical GRBs, such as dirty fireballs. We conclude by discussing the status and future of fast-transient searches in wide-field high-cadence optical surveys.

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  • Perley, Daniel A. (author)
  • Beniamini, Paz (author)
  • Cenko, S. Bradley (author)
  • Kulkarni, S. R. (author)
  • Andreoni, Igor (author)
  • Singer, Leo P. (author)
  • De, Kishalay (author)
  • Kasliwal, Mansi M. (author)
  • Fremling, Christoffer (author)
  • Bellm, Eric C. (author)
  • Dekany, Richard (author)
  • Delacroix, Alexandre (author)
  • Duev, Dmitry A. (author)
  • Goldstein, Daniel A. (author)
  • Golkhou, V. Zach (author)
  • Goobar, ArielStockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)ariel (author)
  • Graham, Matthew J. (author)
  • Hale, David (author)
  • Kupfer, Thomas (author)
  • Laher, Russ R. (author)
  • Masci, Frank J. (author)
  • Miller, Adam A. (author)
  • Neill, James D. (author)
  • Riddle, Reed (author)
  • Rusholme, Ben (author)
  • Shupe, David L. (author)
  • Smith, Roger (author)
  • Sollerman, JesperStockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)solle (author)
  • van Roestel, Jan (author)
  • Stockholms universitetFysikum (creator_code:org_t)

Related titles

  • In:Astrophysical Journal: American Astronomical Society905:20004-637X1538-4357

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