Highly luminous supernovae associated with gamma-ray bursts

0585712 - ASÚ 2025 RIV FR eng J - Journal Article
Kann, D.A. - Rossi, A. - Oates, S.R. - Klose, S. - Blazek, M. - Agüí Fernández, J.F. - Postigo, A. de U. - Thöne, Christina - Schulze, S.
Highly luminous supernovae associated with gamma-ray bursts.
Astronomy & Astrophysics. Roč. 684, April (2024), č. článku A164. ISSN 0004-6361. E-ISSN 1432-0746
Institutional support: RVO:67985815
Keywords : optical afterglow spectrum * supernovae * gamma-ray burst
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 6.5, year: 2022
Method of publishing: Open access

Within the context of a systematic analysis of photometric signatures of GRB-associated SNe, we found an anomalous bump in the late-time transient following GRB 140506A at redshift z = 0.889. We hereby aim to show this bump is significantly more luminous and blue than usual SNe following GRBs. We compiled all available data from the literature and added a full analysis of the Swift/UVOT data, which allowed us to trace the light curve from the first minutes all the way to the host galaxy and to construct a broad spectral energy distribution (SED) of the afterglow that extends the previous SED analysis based on ground-based spectroscopy. We find robust evidence of a late-time bump following the afterglow that shows evidence of a strong color change, with the spectral slope becoming flatter in the blue region of the spectrum. This bump can be interpreted as a luminous SN bump that is spectrally dissimilar to typical GRB-SNe. Correcting it for the large line-of-sight extinction makes the SN associated with GRB 140506A the most luminous detected so far. Even so, it would be in agreement with a luminosity-duration relation of GRB-SNe. Conclusions. While not supported by spectroscopic evidence, it is likely the bump following GRB 140506A is the signature of an SN that is spectrally dissimilar to classical GRB-SNe and more similar to SN 2011kl while being associated with an average GRB, indicating the GRB-SN population is more diverse than previously thought and can reach luminosities comparable to those of superluminous SNe.
Permanent Link: https://hdl.handle.net/11104/0353906