The Multiwavelength Picture of GRB 221009A's Afterglow
arXiv:2308.13854 · doi:10.1093/mnrasl/slad185
Abstract
We present counts-level fits to the keV-GeV data of the early afterglow of the brightest gamma-ray burst detected to date, GRB 221009A. We discuss the complexity of the data reduction due to the unprecedented brightness and the location in the Galactic plane. We find the energy spectrum to be well described as a smoothly broken power law with a break around 10 keV and no indications for additional features towards GeV energies. An interpretation as synchrotron emission from forward-shock accelerated and subsequently cooled electrons yields three possible types of solutions: (1) a slow cooling solution with low magnetic fields (few percent of a Gauss) but poorly constrained minimum injected electron energy (<100 GeV), (2) a fast cooling solution with stronger magnetic fields (few percent to few Gauss) and minimum injected electron energy 10-100 GeV or (3) the transition between both regimes with low magnetic fields and minimum injected electron energy around 100 GeV. Limited statistics at GeV energies prevent conclusions extrapolating towards a cut-off or the onset of a new component at higher energies.
References in corpus (19)
- A tera-electronvolt afterglow from a narrow jet in an extremely bright gamma-ray burst 221009A
- Revealing x-ray and gamma ray temporal and spectral similarities in the GRB 190829A afterglow
- Fermi-GBM Discovery of GRB 221009A: An Extraordinarily Bright GRB from Onset to Afterglow
- IACHEC Cross-Calibration of Chandra, NuSTAR, Swift, Suzaku, and XMM-Newton with 3C 273 and PKS 2155-304
- Properties of the extremely energetic GRB~221009A from Konus-WIND and SRG/ART-XC observations
- GRB 221009A: Discovery of an Exceptionally Rare Nearby and Energetic Gamma-Ray Burst
- The Radio to GeV Afterglow of GRB 221009A
- A Comprehensive Radio View of the Extremely Bright Gamma-Ray Burst 130427A
- GRB 221009A Afterglow from a Shallow Angular Structured Jet
- Two-component jet model for multiwavelength afterglow emission of the extremely energetic burst GRB 221009A
- Constraints on the Model of Gamma-ray Bursts and Implications from GRB 221009A: GeV gamma rays v.s. High-energy Neutrinos
- The Possibility of Modeling the Very High Energy Afterglow of GRB 221009A in a Wind Environment
- Insight-HXMT and GECAM-C observations of the brightest-of-all-time GRB 221009A
- Electron and Ion Acceleration in Relativistic Shocks with Applications to GRB Afterglows
- A semi-analytic afterglow with thermal electrons and synchrotron self-Compton emission
- Using realistic host galaxy metallicities to improve the GRB X-ray equivalent total hydrogen column density and constrain the intergalactic medium density
- GRB 221009A: revealing a hidden afterglow during the prompt emission phase with Fermi-GBM observations
- Investigating time variability of X-ray absorption in Swift GRBs
- Probing the multiwavelength emission scenario of GRB 190114C
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