21. |
- Ahrens, J. et al. Includes Botner, et al.
(författare)
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PERFORMANCE OF THE AMANDA-II DETECTOR
- 2001
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Ingår i: Proceedings of the 27th International Cosmic Ray Conference, Hamburg, Germany, 7-15 August 200. ; , s. 1105-1108
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Konferensbidrag (refereegranskat)
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- Ahrens, J. et al. Includes Botner, et al.
(författare)
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POTENTIAL OF AMANDA-II IN HE NEUTRINO ASTROPHYSICS
- 2001
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Ingår i: Proceedings of the 27th International Cosmic Ray Conference, Hamburg, Germany, 7-15 August 200. ; , s. 1101-1104
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Konferensbidrag (refereegranskat)
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- Ahrens, J., et al.
(författare)
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Results from AMANDA
- 2001
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Ingår i: Proceedings, 9th International Workshop, Venice, Italy, March 6-9, 2001. Vol. 1, 2. ; , s. 569-580
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Konferensbidrag (refereegranskat)
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30. |
- Ahrens, Maryon, et al.
(författare)
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Multi-messenger Observations of a Binary Neutron Star Merger
- 2017
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Ingår i: Astrophysical Journal Letters. - : American Astronomical Society. - 2041-8205 .- 2041-8213. ; 848:2
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Tidskriftsartikel (refereegranskat)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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