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Yes (and good question!). From the article: "The initial binary was composed of two stellar-mass black holes with a source-frame primary mass m1 14.2 M⊙, secondary mass m2 7.5 M⊙, and a total mass of 21.8 M⊙. The binary merged into a black hole of mass 20.8 M⊙, radiating 1.0M⊙ in gravitational waves."

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For reference, one solar mass of radiation is about the same as the output from a gamma ray burst, or about 2000 times the output from a supernova.

Or in less sensical units, the energy from detonating 1% of our galaxy's mass worth of TNT.

Gamma-ray bursts emission is strongly beamed into a small solid angle. So, although their equivalent isotropic energies (that is the energy that would be needed to power gamma-ray bursts if the emission was isotropic) are huge, the actual energies released in gamma-ray bursts are more or less compatible with those of supernovae (~0.1% of a solar mass).

As usual, XKCD provides some help to understand how much energy a supernova is:

"Which of the following would be brighter, in terms of the amount of energy delivered to your retina:

1. A supernova, seen from as far away as the Sun is from the Earth, or

2. The detonation of a hydrogen bomb pressed against your eyeball?

Answer: the supernova, by nine orders of magnitude."

https://what-if.xkcd.com/73/

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