# Have more recent LIGO/VIRGO gravitational wave measurements narrowed down the speed of gravity further?

This answer to How precise are the observational measurements for the speed of gravity? says:

...in 2013 a Chinese group built a model using Earth's tides that helped them narrow it down.

... [T]he speeds of gravity are from 0.93 to 1.05 times the speed of light with a relative error of about 5%. This provides first set of strong evidences to show that the speed of gravity is the same as the speed of light.

This is so far the most accurate measurement I've seen. See the paper for more.

In the near future, LIGO may be able to provide more accurate measurements by comparing the distance among detectors and the delay of observation.

In case the links break, the papers are:

• "Observational evidences for the speed of the gravity based on the Earth tide" TANG KeYun et al. Chinese Science Bulletin, February 2013 Vol.58 No.4-5: 474-477 doi: 10.1007/s11434-012-5603-3
• "Bounding the speed of gravity with gravitational wave observations" Neil Cornish, Diego Blas, Germano Nardini 2017, https://arxiv.org/abs/1707.06101

update: As noted in @amateurAstro's comment and linked well-sourced answer the time between a gravitational wave detection and X-ray burst of GW170817 and GRB 170817A constrains the difference between the speed of gravity and the speed of light to be "...between $$-3 \times 10^{-15}$$ and $$+7 \times 10^{-16}$$ times the speed of light..."

So my updated question is:

Question: Have more recent LIGO/VIRGO gravitational wave measurements narrowed down the speed of gravity further?

• See this related question and answers. – amateurAstro Aug 13 '19 at 2:26
• @amateurAstro I've updated the question to reflect your answer. It was a toss-up; I could have voted to mark this as duplicate as originally written, but this way allows for an updated answer, as well as any further analysis of that event in the subsequent years. Thanks for linking to it! It turns out I'd written about that event a few years ago as well; “Who saw” the binary neutron star merger first? What was the sequence of events? (GRB/GW170817) but completely forgot about it. – uhoh Aug 13 '19 at 3:25
• Unfortunately there hasn't been a second GW with electromagnetic counterpart. And judging from the citations in recent papers the analysis of GW170817 by Abbott, B. P., et al. 2017 is still be the most accurate one (and will likely remain so). – SpaceBread Aug 13 '19 at 12:02
• @SpaceBread then that is the answer to this question. If things change in a few more years (which they certainly might), an answer can be updated or a new answer added. – uhoh Aug 13 '19 at 13:16