Evidence of a Strong 19.5 Hz Flux Oscillation in Swift BAT and Fermi GBM Gamma-Ray Data from GRB 211211A

The gamma-ray burst (GRB) GRB 211211A is believed to have occurred due to the merger of two neutron stars or a neutron star and a black hole, despite its duration of more than a minute. Subsequent analysis has revealed numerous interesting properties including the possible presence of a ∼22 Hz quasi...

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Bibliographic Details
Published in:The Astrophysical journal 2024-05, Vol.967 (1), p.26
Main Authors: Chirenti, Cecilia, Dichiara, Simone, Lien, Amy, Miller, M. Coleman
Format: Article
Language:English
Subjects:
Black holes
Gamma ray astronomy
Gamma ray bursts
Gamma rays
Neutron stars
Precursors
Relativistic binary stars
Star mergers
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Summary:The gamma-ray burst (GRB) GRB 211211A is believed to have occurred due to the merger of two neutron stars or a neutron star and a black hole, despite its duration of more than a minute. Subsequent analysis has revealed numerous interesting properties including the possible presence of a ∼22 Hz quasiperiodic oscillation (QPO) during precursor emission. Here we perform timing analysis of Fermi and Swift gamma-ray data on GRB 211211A and, although we do not find a strong QPO during the precursor, we do find an extremely significant 19.5 Hz flux oscillation, which has higher fractional amplitude at higher energies, in a ∼0.2 s segment beginning ∼1.6 s after the start of the burst. After presenting our analysis we discuss possible mechanisms for the oscillation.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/ad3bb7