Not that much information (YET!) but still, I got goosebumps... From Czech Physicist Luboš Motl:
Fermi saw gamma rays 0.4 seconds after the LIGO merger
Ted has informed us about a fascinating new paper by the Fermi gamma-ray telescope previously known as Glast,
Fermi GBM Observations of LIGO Gravitational Wave event GW150914 (arXiv; NASA copy)
Some 0.4 seconds after the gravitational wave from the black hole merger detected as gravitational waves in LIGO, Fermi saw a signal of gamma rays above 50keV50keV with the false positive probability of 0.2%.
Note that 0.4 seconds is 10-17 times 1.3 billion years. So if you believe that the gamma-ray and gravitational-wave signals came from the same event, this represents a test of the equality between the speed of light and the speed of gravitational waves whose relative precision is approximately 10−17.
The coorelation between the two events is pretty good and we know that gamma rays travel at the speed of light. Do we now think that gravitational waves also travel at the speed of light?
Like I said - goosebumps...
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