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From Wikipedia, the free encyclopedia
GRB 111209A is the longest lasting gamma-ray burst (GRB) detected by the Swift Gamma-Ray Burst Mission, observed on December 9, 2011.[1] Its duration is longer than 7 hours, implying this event has a different kind of progenitor than normal long GRBs. It was first proposed that the progenitor of this event was a blue supergiant star with low metallicity. Later, it was also proposed that this event is the prototype of a new class of GRBs, ultra-long GRBs.
Event type | Gamma-ray burst, supernova |
---|---|
SNSLSN | |
Duration | at least 7 hours |
Constellation | Phoenix |
Right ascension | 00h 57m 22.63s |
Declination | −46° 48′ 03.8″ |
Other designations | GRB 111209A, SN 2011kl |
The GRB was associated with the magnetar-powered supernova 2011kl, an object of intermediate luminosity between conventional GRB supernovae and superluminous supernovae.[2]
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