Three-Step Observation (IMAGE)
Caption
Three-step observation: the first sign of the neutron-star merger on 17 August 2017 was a brief burst of gamma rays discovered by US satellite Fermi (above). Soon after, scientists from the LIGO-Virgo cooperation reported that their detectors had recorded the gravitational waves 1.7 seconds before the Fermi burst (middle). A little later, scientists reported that the burst was also observed with an instrument aboard the European satellite Integral.
Credit
NASA's Goddard Space Flight Center, Caltech/MIT/LIGO Lab and ESA
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