Other designations GRB 111209A Date 9 December 2011 | Duration at least 7 hours | |
Instrument Swift Gamma-Ray Burst Mission | ||
GRB 111209A is the longest lasting gamma-ray burst (GRB) detected by the Swift Gamma-Ray Burst Mission on December 9, 2011. 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 has also been proposed that this event is the prototype of a new class of GRBs, ultra-long GRBs.
The GRB was associated with the magnetar-powered supernova 2011kl, an object of intermediate luminosity between conventional GRB supernovae and superluminous supernovae
References
GRB 111209A Wikipedia(Text) CC BY-SA