The recent discovery of a kilonova from the long-duration gamma-ray burst (GRB) GRB 211211A challenges classification schemes based on temporal information alone. Gamma-ray properties of GRB 211211A reveal an extreme event, which stands out among both short and long GRBs. We find very short variations (few milliseconds) in the lightcurve of GRB 211211A and estimate ∼1000 for the Lorentz factor of the outflow. We discuss the relevance of the short variations in identifying similar long GRBs resulting from compact mergers. Our findings indicate that in future gravitational-wave follow-up campaigns, some long-duration GRBs should be treated as possible strong gravitational-wave counterparts.
Extreme Variability in a Long-duration Gamma-Ray Burst Associated with a Kilonova / Veres, P.; Bhat, P. N.; Burns, E.; Hamburg, R.; Fraija, N.; Kocevski, D.; Preece, R.; Poolakkil, S.; Christensen, N.; Bizouard, M. A.; Dal Canton, T.; Bala, S.; Bissaldi, E.; Briggs, M. S.; Cleveland, W.; Goldstein, A.; Hristov, B. A.; Hui, C. M.; Lesage, S.; Mailyan, B.; Roberts, O. J.; Wilson-Hodge, C. A.. - In: THE ASTROPHYSICAL JOURNAL LETTERS. - ISSN 2041-8205. - 954:1(2023), p. L5. [10.3847/2041-8213/ace82d]
Extreme Variability in a Long-duration Gamma-Ray Burst Associated with a Kilonova
Bissaldi E.Membro del Collaboration Group
;
2023-01-01
Abstract
The recent discovery of a kilonova from the long-duration gamma-ray burst (GRB) GRB 211211A challenges classification schemes based on temporal information alone. Gamma-ray properties of GRB 211211A reveal an extreme event, which stands out among both short and long GRBs. We find very short variations (few milliseconds) in the lightcurve of GRB 211211A and estimate ∼1000 for the Lorentz factor of the outflow. We discuss the relevance of the short variations in identifying similar long GRBs resulting from compact mergers. Our findings indicate that in future gravitational-wave follow-up campaigns, some long-duration GRBs should be treated as possible strong gravitational-wave counterparts.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
