Fermi-GBM Team Analysis on The Ravasio Line
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| author | Burns, Eric Lesage, Stephen Goldstein, Adam Briggs, Michael S. Veres, Peter Bala, Suman de Barra, Cuan Bissaldi, Elisabetta Cleveland, William H Giles, Misty M Godwin, Matthew Hristov, Boyan A. Hui, C. Michelle Kocevski, Daniel Mailyan, Bagrat Malacaria, Christian McBreen, Sheila Preece, Robert Roberts, Oliver J. Scotton, Lorenzo von Kienlin, A. Wilson-Hodge, Colleen A. Wood, Joshua |
| author_facet | Burns, Eric Lesage, Stephen Goldstein, Adam Briggs, Michael S. Veres, Peter Bala, Suman de Barra, Cuan Bissaldi, Elisabetta Cleveland, William H Giles, Misty M Godwin, Matthew Hristov, Boyan A. Hui, C. Michelle Kocevski, Daniel Mailyan, Bagrat Malacaria, Christian McBreen, Sheila Preece, Robert Roberts, Oliver J. Scotton, Lorenzo von Kienlin, A. Wilson-Hodge, Colleen A. Wood, Joshua |
| contents | The prompt spectra of gamma-ray bursts are known to follow broadband continuum behavior over decades in energy. GRB 221009A, given the moniker the brightest of all time (BOAT), is the brightest gamma-ray burst identified in half a century of observations, and was first identified by the Fermi Gamma-ray Burst Monitor (GBM). On behalf of the Fermi-GBM Team, Lesage et al. (2023) described the initial GBM analysis. Ravasio et al. (2024) report the identification of a spectral line in part of the prompt emission of this burst, which they describe as evolving over 80 s from $\sim$12 MeV to 6 MeV. We report a GBM Team analysis on the Ravasio Line: 1) We cannot identify an instrumental effect that could have produced this signal, and 2) our method of calculating the statistical significance of the line shows it easily exceeds the 5$σ$ discovery threshold. We additionally comment on the claim of the line beginning at earlier time intervals, up to 37 MeV, as reported in Zhang et al. (2024). We find that it is reasonable to utilize these measurements for characterization of the line evolution, with caution. We encourage theoretical studies exploring this newly discovered gamma-ray burst spectral feature, unless any rigorous alternative explanation unrelated to the emission from GRB 221009A is identified. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2410_00286 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Fermi-GBM Team Analysis on The Ravasio Line Burns, Eric Lesage, Stephen Goldstein, Adam Briggs, Michael S. Veres, Peter Bala, Suman de Barra, Cuan Bissaldi, Elisabetta Cleveland, William H Giles, Misty M Godwin, Matthew Hristov, Boyan A. Hui, C. Michelle Kocevski, Daniel Mailyan, Bagrat Malacaria, Christian McBreen, Sheila Preece, Robert Roberts, Oliver J. Scotton, Lorenzo von Kienlin, A. Wilson-Hodge, Colleen A. Wood, Joshua High Energy Astrophysical Phenomena Applications The prompt spectra of gamma-ray bursts are known to follow broadband continuum behavior over decades in energy. GRB 221009A, given the moniker the brightest of all time (BOAT), is the brightest gamma-ray burst identified in half a century of observations, and was first identified by the Fermi Gamma-ray Burst Monitor (GBM). On behalf of the Fermi-GBM Team, Lesage et al. (2023) described the initial GBM analysis. Ravasio et al. (2024) report the identification of a spectral line in part of the prompt emission of this burst, which they describe as evolving over 80 s from $\sim$12 MeV to 6 MeV. We report a GBM Team analysis on the Ravasio Line: 1) We cannot identify an instrumental effect that could have produced this signal, and 2) our method of calculating the statistical significance of the line shows it easily exceeds the 5$σ$ discovery threshold. We additionally comment on the claim of the line beginning at earlier time intervals, up to 37 MeV, as reported in Zhang et al. (2024). We find that it is reasonable to utilize these measurements for characterization of the line evolution, with caution. We encourage theoretical studies exploring this newly discovered gamma-ray burst spectral feature, unless any rigorous alternative explanation unrelated to the emission from GRB 221009A is identified. |
| title | Fermi-GBM Team Analysis on The Ravasio Line |
| topic | High Energy Astrophysical Phenomena Applications |
| url | https://arxiv.org/abs/2410.00286 |