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Tag archives: multimessenger astronomy

Neutron star merger as it happened

All around the world: observatories that looked-out for GW170817 (Courtesy: LIGO-Virgo)

All around the world: observatories that saw GW170817 (Courtesy: LIGO-Virgo)

By Hamish Johnston

At 12:41:20 UTC on 17 August, the Fermi Gamma-ray Space Telescope sent a notice to the astronomy community saying that it had detected a gamma-ray burst. Normally such an event wouldn’t raise much fuss – but this time things would be very different.

Back on Earth, scientists working on the LIGO-Virgo gravitational wave detectors were busy analysing a signal that had arrived about 2 s before the gamma-ray burst and looked very much like the merger of two neutron stars. Such a cataclysmic event is expected to give off copious amounts of electromagnetic radiation including an initial burst of gamma rays.

(more…)

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