Search for transient gamma-ray emission from magnetar flares using Fermi-LAT
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arXiv
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| Natura: | Preprint |
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2024
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| _version_ | 1866912485421875200 |
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| author | Ramakrishnan, Vyaas Desai, Shantanu |
| author_facet | Ramakrishnan, Vyaas Desai, Shantanu |
| contents | We search for transient gamma-ray emission in the energy range from 0.1-10 GeV using data from the Fermi-LAT telescope in coincidence with magnetar flares. For our analysis, we look for coincidence with 15 distinct flares from 11 magnetars using three time windows of $\pm$ 1 day, $\pm$ 7 days, and $\pm$ 15 days. For 14 of these flares from 10 magnetars, we do not see any statistically significant gamma-ray emission. However, we see one possible gamma-ray flare from one magnetar, namely 1E 1048.1-5937, with combined significance of $4.4σ$, (after considering the look-elsewhere effect) observed after about 10 days from the start of the X-ray flare. However, this magnetar is located close to the galactic plane (with galactic latitude of -0.52\degree), and this signal could be caused by contamination due to diffuse flux from gamma-ray sources in the galactic plane. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_03900 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Search for transient gamma-ray emission from magnetar flares using Fermi-LAT Ramakrishnan, Vyaas Desai, Shantanu High Energy Astrophysical Phenomena We search for transient gamma-ray emission in the energy range from 0.1-10 GeV using data from the Fermi-LAT telescope in coincidence with magnetar flares. For our analysis, we look for coincidence with 15 distinct flares from 11 magnetars using three time windows of $\pm$ 1 day, $\pm$ 7 days, and $\pm$ 15 days. For 14 of these flares from 10 magnetars, we do not see any statistically significant gamma-ray emission. However, we see one possible gamma-ray flare from one magnetar, namely 1E 1048.1-5937, with combined significance of $4.4σ$, (after considering the look-elsewhere effect) observed after about 10 days from the start of the X-ray flare. However, this magnetar is located close to the galactic plane (with galactic latitude of -0.52\degree), and this signal could be caused by contamination due to diffuse flux from gamma-ray sources in the galactic plane. |
| title | Search for transient gamma-ray emission from magnetar flares using Fermi-LAT |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2412.03900 |