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Search for transient gamma-ray emission from magnetar flares using Fermi-LAT

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arxiv 2412.03900 v2 pith:5WSQFF3Q submitted 2024-12-05 astro-ph.HE

Search for transient gamma-ray emission from magnetar flares using Fermi-LAT

classification astro-ph.HE
keywords gamma-rayflaresmagnetardaysemissiongalacticcoincidencefermi-lat
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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 $4.4\sigma$, (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.

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  1. Gamma Rays from ALP-Photon Conversion and Inverse Compton Reprocessing in Neutron Star Magnetospheres

    astro-ph.HE 2026-08 conditional novelty 5.0

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