GRB 100621A

Event typeGamma-ray burst 

ConstellationIndus 

Right ascension21^h 01^m 13.12^s

Declination−51° 06′ 22.5″

GRB 100621A

Event type	Gamma-ray burst
Constellation	Indus
Right ascension	21h 01m 13.12s
Declination	−51° 06′ 22.5″
Other designations	GRB 100621A
[edit on Wikidata]

GRB 100621A was a long gamma-ray burst observed on June 21, 2010, by the Swift spacecraft.^[1][2] It is the third brightest gamma-ray burst yet observed, after GRB 221009A and GRB 130427A. However when it was discovered, it was the brightest GRB in terms of X-ray brightness.^[3][4] GRB 100621A is approximately five billion light years from Earth.