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Troja, E; Fryer, C L; O'Connor, B; Ryan, G; Dichiara, S; Kumar, A; Ito, N; Gupta, R; Wollaeger, R T; Norris, J P; Kawai, N; Butler, N R; Aryan, A; Misra, K; Hosokawa, R; Murata, K L; Niwano, M; Pandey, S B; Kutyrev, A; van Eerten, H J; Chase, E A; Hu, Y-D; Caballero-Garcia, M D; Castro-Tirado, A J
Nature, 12/2022, Volume: 612, Issue: 7939Journal Article
Gamma-ray bursts (GRBs) are flashes of high-energy radiation arising from energetic cosmic explosions. Bursts of long (greater than two seconds) duration are produced by the core-collapse of massive stars , and those of short (less than two seconds) duration by the merger of compact objects, such as two neutron stars . A third class of events with hybrid high-energy properties was identified , but never conclusively linked to a stellar progenitor. The lack of bright supernovae rules out typical core-collapse explosions , but their distance scales prevent sensitive searches for direct signatures of a progenitor system. Only tentative evidence for a kilonova has been presented . Here we report observations of the exceptionally bright GRB 211211A, which classify it as a hybrid event and constrain its distance scale to only 346 megaparsecs. Our measurements indicate that its lower-energy (from ultraviolet to near-infrared) counterpart is powered by a luminous (approximately 10 erg per second) kilonova possibly formed in the ejecta of a compact object merger.
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