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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: it had a peak visual apparent magnitude of 5.3 and remained visible to human eyes for approximately 30 seconds. The magnitude was brighter than 9.0 for approximately 60 seconds.
If viewed from 1 AU away, it would have had a peak apparent magnitude of -67.57 (for comparison the Sun has an apparent magnitude of -27).
visible to human eye