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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
- Article/chapterEnglish2020
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2020-12-17
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American Astronomical Society,2020
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LIBRIS-ID:oai:DiVA.org:su-189183
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https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-189183URI
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https://doi.org/10.3847/1538-4357/abc34dDOI
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
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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.
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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, ArielStockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)ariel
(author)
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Graham, Matthew J.
(author)
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Hale, David
(author)
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Kupfer, Thomas
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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, JesperStockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)solle
(author)
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van Roestel, Jan
(author)
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Stockholms universitetFysikum
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In:Astrophysical Journal: American Astronomical Society905:20004-637X1538-4357
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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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Singer, Leo P.
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De, Kishalay
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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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