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- Ahrens, Maryon, et al.
(author)
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Multi-messenger Observations of a Binary Neutron Star Merger
- 2017
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In: Astrophysical Journal Letters. - : American Astronomical Society. - 2041-8205 .- 2041-8213. ; 848:2
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Journal article (peer-reviewed)abstract
- On 2017 August 17 a binary neutron star coalescence candidate (later designated GW170817) with merger time 12:41:04 UTC was observed through gravitational waves by the Advanced LIGO and Advanced Virgo detectors. The Fermi Gamma-ray Burst Monitor independently detected a gamma-ray burst (GRB 170817A) with a time delay of similar to 1.7 s with respect to the merger time. From the gravitational-wave signal, the source was initially localized to a sky region of 31 deg(2) at a luminosity distance of 40(-8)(+8) Mpc and with component masses consistent with neutron stars. The component masses were later measured to be in the range 0.86 to 2.26 M-circle dot. An extensive observing campaign was launched across the electromagnetic spectrum leading to the discovery of a bright optical transient (SSS17a, now with the IAU identification of AT 2017gfo) in NGC 4993 (at similar to 40 Mpc) less than 11 hours after the merger by the One-Meter, Two Hemisphere (1M2H) team using the 1 m Swope Telescope. The optical transient was independently detected by multiple teams within an hour. Subsequent observations targeted the object and its environment. Early ultraviolet observations revealed a blue transient that faded within 48 hours. Optical and infrared observations showed a redward evolution over similar to 10 days. Following early non-detections, X-ray and radio emission were discovered at the transient's position similar to 9 and similar to 16 days, respectively, after the merger. Both the X-ray and radio emission likely arise from a physical process that is distinct from the one that generates the UV/optical/near-infrared emission. No ultra-high-energy gamma-rays and no neutrino candidates consistent with the source were found in follow-up searches. These observations support the hypothesis that GW170817 was produced by the merger of two neutron stars in NGC4993 followed by a short gamma-ray burst (GRB 170817A) and a kilonova/macronova powered by the radioactive decay of r-process nuclei synthesized in the ejecta.
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- Botner, Olga, et al.
(author)
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AMANDA: Status and Latest Results
- 2004
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In: 39th Rencontres De Moriond On Electroweak Interactions And Unified Theories, 21-28 Mar 2004, La Thuile, Aosta Valley, Italy.
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Conference paper (other academic/artistic)
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- Botner, Olga, et al.
(author)
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Design and Status of IceCube
- 2004
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In: 10th Vienna Conference On Instrumentation, 16-21 February 2004, Vienna, Austria.
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Conference paper (other academic/artistic)
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- Botner, Olga, et al.
(author)
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Exotic Particle Detection with the AMANDA Detector
- 2003
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In: Proceedings of the 23rd International Conference on Physics in Collision (PIC 2003), Zeuthen, Germany, 26-28 June 2003.
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Conference paper (other academic/artistic)
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