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GRB 111209A, one of the longest Gamma-Ray Bursts (GRBs) ever observed, islinked to SN 2011kl, the most luminous GRB-Supernova (SN) detected so far,which shows evidence for being powered by a magnetar central engine. We placeSN 2011kl into the context of large samples of SNe, addressing in more detailthe question of whether it could be radioactively powered, and whether itrepresents an extreme version of a GRB-SN or an underluminous Superluminous SN(SLSN). We model SN 2011kl using SN 1998bw as a template and derive abolometric light curve including near-infrared data. We compare the propertiesof SN 2011kl to literature results on stripped-envelope and superluminoussupernovae. Comparison in the k,s context, i.e., comparing it to SN 1998bwtemplates in terms of luminosity and light-curve stretch, clearly shows SN2011kl is the most luminous GRB-SN to date, and it is spectrally verydissimilar to other events, being significantly bluer/hotter. Although SN2011kl does not reach the classical luminosity threshold of SLSNe and evolvesfaster than any of them, it resembles SLSNe more than the classicalGRB-associated broad-lined Type Ic SNe in several aspects. GRB 111209A was avery energetic event, both at early (prompt emission) and at very late (SN)times. We have shown in a further publication that with the exception of theextreme duration, the GRB and afterglow parameters are in agreement with theknown distributions for these parameters. SN 2011kl, on the other hand, isexceptional both in luminosity and spectral characteristics, indicating thatGRB 111209A was likely not powered by a standard-model collapsar centralengine, further supporting our earlier conclusions. Instead, it reveals thepossibility of a direct link between GRBs and SLSNe.

astronomy and astrophysics

Highly Luminous Supernovae associated with Gamma-Ray Bursts I.: GRB  111209A/SN 2011kl in the Context of Stripped-Envelope and Superluminous  Supernovae