GRB 111209A

GRB 111209A
Event type	Gamma-ray burst, supernova
SNSLSN
Duration	at least 7 hours
Constellation	Phoenix
Right ascension	00^h 57^m 22.63^s
Declination	−46° 48′ 03.8″
Other designations	GRB 111209A, SN 2011kl
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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.

The GRB was associated with the magnetar-powered supernova 2011kl, an object of intermediate luminosity between conventional GRB supernovae and superluminous supernovae.^[2]

References

^ Gendre, B.; Stratta, G.; Atteia, J. L.; Basa, S.; Boër, M.; Coward, D. M.; Cutini, S.; D'Elia, V.; Howell, E. J.; Klotz, A.; Piro, L. (2013). "The Ultra-long Gamma-Ray Burst 111209A: The Collapse of a Blue Supergiant?". Astrophysical Journal. 766 (1): 30. arXiv:1212.2392. Bibcode:2013ApJ...766...30G. doi:10.1088/0004-637X/766/1/30. S2CID 118618287.
^ Greiner, J.; et al. (2015). "A very luminous magnetar-powered supernova associated with an ultra-long γ-ray burst". Nature. 523 (7559): 189–192. arXiv:1509.03279. Bibcode:2015Natur.523..189G. doi:10.1038/nature14579. PMID 26156372. S2CID 4464998.