With the interferometers they can estimate the mass of the 2 objects entering in collision and the resulting one.
Since there are multiple interferometers, they can also point to the region of the sky it happens. The “alert” can be picked up by other observatories which can look there on all frequencies.
Depending on if there is an explosion or not they can confirm if the objects were neutron stars or black hole (the details are a bit fuzzy on my head for the black hole / neutron star merger).
With the interferometers they can estimate the mass of the 2 objects entering in collision and the resulting one.
Since there are multiple interferometers, they can also point to the region of the sky it happens. The “alert” can be picked up by other observatories which can look there on all frequencies.
Depending on if there is an explosion or not they can confirm if the objects were neutron stars or black hole (the details are a bit fuzzy on my head for the black hole / neutron star merger).