Sure. When supernovae do their thing they produce a lot of short lived radioisotopes. One of those isotopes is Cobalt-56. They were able to measure the emission spectrum of the supernova remnants and measure the disappearance of 56Co. They calculated a decay rate of 113 +/- 23 days for the half life of 56Co in the supernova which is in good agreement with 111.3 day half life of 56Co here on Earth.
Direct Observation of Radioactive Cobalt Decay in Supernova 1987A
Supernova 1987a was about 160,000 light years away, so this is confirmation that the decay rates were the same 160,000 years ago.