Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 482, Issue 1, Pages L46-L49Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnrasl/sly166
Keywords
gravitational waves; methods: data-analysis; stars: neutron; gamma-ray bursts: individual: GRB170817A
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Funding
- National Research Foundation of Korea [2015R1D1A1A01059793, 2016R1A5A1013277, 2018044640]
- U.S. National Science Foundation
- MEXT [24103005]
- JSPS [26000005]
- joint research program of the Institute for Cosmic Ray Research
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The recent LIGO event GW170817 is the merger of a double neutron star system with an associated short GRB170817A with 2.9 +/- 0.3 s soft emission over 8-70 keV. This association has a Gaussian equivalent level of confidence of 5.1 sigma. The merger produced a hypermassive neutron star or stellar mass black hole with prompt or continuous energy output powering GRB170817A. Here, we report on a possible detection of extended emission (EE) in gravitational radiation during GRB170817A: a descending chirp with characteristic time-scale tau(s) = 3.01 +/- 0.2 s in a (H1, L1)-spectrogram up to 700 Hz with Gaussian equivalent level of confidence greater than 3.3 sigma based on causality alone following edge detection applied to (H1, L1)-spectrograms merged by frequency coincidences. Additional confidence derives from the strength of this EE. The observed frequencies below 1 kHz indicate a hypermassive magnetar rather than a black hole, spinning down by magnetic winds and interactions with dynamical mass ejecta.
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