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ZTF20aajnksq (AT 20...
ZTF20aajnksq (AT 2020blt) : A Fast Optical Transient at z ≈ 2.9 with No Detected Gamma-Ray Burst Counterpart
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Ho, Anna Y. Q. (author)
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Perley, Daniel A. (author)
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Beniamini, Paz (author)
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Cenko, S. Bradley (author)
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Kulkarni, S. R. (author)
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Andreoni, Igor (author)
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Singer, Leo P. (author)
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De, Kishalay (author)
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Kasliwal, Mansi M. (author)
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Fremling, Christoffer (author)
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Bellm, Eric C. (author)
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Dekany, Richard (author)
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Delacroix, Alexandre (author)
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Duev, Dmitry A. (author)
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Goldstein, Daniel A. (author)
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Golkhou, V. Zach (author)
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- Goobar, Ariel (author)
- Stockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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Graham, Matthew J. (author)
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Hale, David (author)
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Kupfer, Thomas (author)
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Laher, Russ R. (author)
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Masci, Frank J. (author)
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Miller, Adam A. (author)
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Neill, James D. (author)
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Riddle, Reed (author)
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Rusholme, Ben (author)
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Shupe, David L. (author)
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Smith, Roger (author)
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- Sollerman, Jesper (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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van Roestel, Jan (author)
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(creator_code:org_t)
- 2020-12-17
- 2020
- English.
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In: Astrophysical Journal. - : American Astronomical Society. - 0004-637X .- 1538-4357. ; 905:2
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https://doi.org/10.3...
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http://arxiv.org/pdf...
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https://doi.org/10.3...
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Abstract
Subject headings
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- 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.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- Gamma-ray bursts
- Radio transient sources
- Transient sources
- X-ray transient sources
- Sky surveys
- Surveys
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Ho, Anna Y. Q.
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Perley, Daniel A ...
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Beniamini, Paz
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Cenko, S. Bradle ...
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Kulkarni, S. R.
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Andreoni, Igor
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show more...
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Singer, Leo P.
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De, Kishalay
-
Kasliwal, Mansi ...
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Fremling, Christ ...
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Bellm, Eric C.
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Dekany, Richard
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Delacroix, Alexa ...
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Duev, Dmitry A.
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Goldstein, Danie ...
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Golkhou, V. Zach
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Goobar, Ariel
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Graham, Matthew ...
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Hale, David
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Kupfer, Thomas
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Laher, Russ R.
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Masci, Frank J.
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Miller, Adam A.
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Neill, James D.
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Riddle, Reed
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Rusholme, Ben
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Shupe, David L.
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Smith, Roger
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Sollerman, Jespe ...
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van Roestel, Jan
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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Astrophysical Jo ...
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Stockholm University