The redness of the afterglow is indicative of the event's distanceFrom The BBC:
Astronomers have confirmed that an exploding star spotted by Nasa's Swift satellite is the most distant cosmic object to be detected by telescopes.
In the journal Nature, two teams of astronomers report their observations of a gamma-ray burst from a star that died 13.1 billion light-years away.
The massive star died about 630 million years after the Big Bang.
UK astronomer Nial Tanvir described the observation as "a step back in cosmic time".
Professor Tanvir led an international team studying the afterglow of the explosion, using the United Kingdom Infrared Telescope (UKIRT) in Hawaii.
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