Back to Search
Start Over
GRB 091029: at the limit of the fireball scenario
- Source :
- NASA Astrophysics Data System
-
Abstract
- Using high-quality, broad-band afterglow data for GRB 091029, we test the validity of the forward-shock model for gamma-ray burst afterglows. We used multi-wavelength (NIR to X-ray) follow-up observations obtained with the GROND, BOOTES-3/YA and Stardome optical ground-based telescopes, and the UVOT and the XRT onboard the Swift satellite. To explain the almost totally decoupled light curves in the X-ray and optical/NIR domains, a two-component outflow is proposed. Several models are tested, including continuous energy injection, components with different electron energy indices and components in two different stages of spectral evolution. Only the last model can explain both the decoupled light curves with asynchronous peaks and the peculiar SED evolution. However, this model has so many unknown free parameters that we are unable to reliably confirm or disprove its validity, making the afterglow of GRB 091029 difficult to explain in the framework of the simplest fireball model.<br />Comment: Accepted to A&A
- Subjects :
- Physics
High Energy Astrophysical Phenomena (astro-ph.HE)
Swift Gamma-Ray Burst Mission
Astrophysics::High Energy Astrophysical Phenomena
FOS: Physical sciences
Astronomy and Astrophysics
Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
gamma rays: ISM, gamma-ray burst: individual: GRB 091029, ISM: jets and outflows, X-rays: individuals: GRB 091029
Light curve
Afterglow
FIS/05 - ASTRONOMIA E ASTROFISICA
Space and Planetary Science
Outflow
Limit (mathematics)
Astrophysics - High Energy Astrophysical Phenomena
Gamma-ray burst
Energy (signal processing)
Free parameter
Subjects
Details
- Database :
- OpenAIRE
- Journal :
- NASA Astrophysics Data System
- Accession number :
- edsair.doi.dedup.....b965d08e3aa5aed7d61e230592422f0e
- Full Text :
- https://doi.org/10.1051/0004-6361/201219583