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Astrophysics > High Energy Astrophysical Phenomena
Title: GRB 221009A, its precursor and two afterglows in the Fermi data
(Submitted on 7 Mar 2023 (v1), last revised 21 Mar 2023 (this version, v2))
Abstract: We study GRB 221009A, the brightest gamma-ray burst in the history of observations, using Fermi data. To calibrate them for large inclination angles, we use the Vela X gamma-ray source. Light curves in different spectral ranges demonstrate a 300 s overlap of afterglow and delayed episodes of soft prompt emission. We demonstrate that a relatively weak burst precursor that occurs 3 minutes before the main episode has its own afterglow, i.e., presumably, its own external shock. The main afterglow is the brightest one, includes a photon with an energy of 400 GeV 9 hours after the burst, and is visible in the LAT data for up to two days.
Submission history
From: Boris Stern Dr. [view email][v1] Tue, 7 Mar 2023 12:44:56 GMT (635kb,D)
[v2] Tue, 21 Mar 2023 13:59:57 GMT (640kb,D)
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