Mapping LIGO Detections on the Sky

Image credit: LIGO/Axel Mellinger

The approximate locations of the two gravitational-wave events detected so far by LIGO are shown on this sky map of the southern hemisphere. The colored lines represent different probabilities for where the signal originated: the outer purple line defines the region where the signal is predicted to have come from with a 90 percent confidence level; the inner yellow line defines the target region at a 10 percent confidence level.