Transient
The first kilonova ever observed alongside gravitational waves, produced when two neutron stars merged and forged heavy elements including gold.
| Type | Transient |
|---|---|
| Event type | Kilonova |
| Distance from Earth | 130,000,000 ly |
| Apparent magnitude | 17.5 |
| Redshift | 0.00973 |
| Discovered | 2017 |
The light reaching us from AT 2017gfo tonight left it around 130,000,000 years ago.
Of the 5 transients these pages cover, only 2 lie closer to us.
Its light arrives redshifted by z = 0.00973, stretched on the way here by the universe's expansion.
It has been on record since 2017.
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