2023/10/19 by Cecilia Chirenti, S. Dichiara, Chirenti, Cecilia +5 · 1 citation
Physics and Astronomy · #Astrophysical Phenomena and Observations #FOS: Physical sciences #Gamma-ray bursts and supernovae #High Energy Astrophysical Phenomena (astro-ph.HE) #Nuclear Physics and Applications
paper · pdf · doi:10.48550/arxiv.2310.12875
openalex publication_date 2023/10/19 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
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~second segment beginning ∼ 1.6~seconds after the start of the burst. After presenting our analysis we discuss possible mechanisms for the oscillation.