GRB 080319B

GRB 080319B was a gamma-ray burst (GRB) detected by the Swift satellite at 06:12 UTC on March 19, 2008. The burst set a new record for the farthest object that was observable with the naked eye:[2] it had a peak visual apparent magnitude of 5.8 and remained visible to human eyes for approximately 30 seconds.[3] The magnitude was brighter than 9.0 for approximately 60 seconds.[4]

https://en.wikipedia.org/wiki/GRB_080319B 

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