Unveiling the enigma of ATLAS17aeu
Journal
Date Issued
2019
Author(s)
•
•
•
D'Elia, V.
•
•
•
Levan, A. J.
•
Branchesi, M.
•
Castro-Tirado, A. J.
•
•
Hu, Y. -D.
•
•
Tanvir, N. R.
•
•
•
•
•
•
•
•
•
Fan, X.
•
Garnavich, P.
•
•
Greco, G.
•
Hjorth, J.
•
Lyman, J. D.
•
•
O'Brien, P.
•
•
Perego, A.
•
•
•
•
Yang, S.
•
•
Caballero-García, M. D.
•
Fruchter, A. S.
•
Giunta, A.
•
Longo, F.
•
•
Sokolov, V. V.
•
•
Valeev, A. F.
•
Abstract
Aims: The unusual transient ATLAS17aeu was serendipitously detected within the sky localisation of the gravitational wave trigger GW 170104. The importance of a possible association with gravitational waves coming from a binary black hole merger led to an extensive follow-up campaign, with the aim of assessing a possible connection with GW 170104. Methods: With several telescopes, we carried out both photometric and spectroscopic observations of ATLAS17aeu, for several epochs, between ∼3 and ∼230 days after the first detection.
Results: We studied in detail the temporal and spectroscopic properties of ATLAS17aeu and its host galaxy. Although at low significance and not conclusive, we found similarities to the spectral features of a broad-line supernova superposed onto an otherwise typical long-GRB afterglow. Based on analysis of the optical light curve, spectrum, and host galaxy spectral energy distribution, we conclude that the redshift of the source is probably z ≃ 0.5 ± 0.2.
Conclusions: While the redshift range we have determined is marginally compatible with that of the gravitational wave event, the presence of a supernova component and the consistency of this transient with the Ep-Eiso correlation support the conclusion that ATLAS17aeu was associated with the long gamma-ray burst GRB 170105A. This rules out the association of the GRB 170105A/ATLAS17aeu transient with the gravitational wave event GW 170104, which was due to a binary black hole merger.
Results: We studied in detail the temporal and spectroscopic properties of ATLAS17aeu and its host galaxy. Although at low significance and not conclusive, we found similarities to the spectral features of a broad-line supernova superposed onto an otherwise typical long-GRB afterglow. Based on analysis of the optical light curve, spectrum, and host galaxy spectral energy distribution, we conclude that the redshift of the source is probably z ≃ 0.5 ± 0.2.
Conclusions: While the redshift range we have determined is marginally compatible with that of the gravitational wave event, the presence of a supernova component and the consistency of this transient with the Ep-Eiso correlation support the conclusion that ATLAS17aeu was associated with the long gamma-ray burst GRB 170105A. This rules out the association of the GRB 170105A/ATLAS17aeu transient with the gravitational wave event GW 170104, which was due to a binary black hole merger.
Based on observations made with the following telescopes: Copernico, TNG (under programme A34TAC_24), GTC (under programmes GTCMULTIPLE2D-16B and GTCMULTIPLE2G-17A), LBT (under programme 2016_2017_19), and HST (under programme GO14270).Spectral data for this source shown on this paper are available on the Weizmann Interactive Supernova Data Repository (WISeREP, http://https://wiserep.weizmann.ac.il/).
Volume
621
Start page
A81
Issn Identifier
0004-6361
Ads BibCode
2019A&A...621A..81M
Rights
open.access
File(s)![Thumbnail Image]()
Loading...
Name
aa33814-18.pdf
Description
Pdf editoriale
Size
1.34 MB
Format
Adobe PDF
Checksum (MD5)
dc2b0b3b7099983d26e072b23b98719f