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Multiwavelength Vie...
Multiwavelength View of the Close-by GRB 190829A Sheds Light on Gamma-Ray Burst Physics
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- Salafia, Om Sharan (author)
- Istituto nazionale di astrofisica (INAF),Istituto Nazionale di Fisica Nucleare,National Institute for Nuclear Physics,Universita' degli Studi di Milano-Bicocca,University of Milano-Bicocca
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- Ravasio, Maria Edvige (author)
- Istituto nazionale di astrofisica (INAF),Universita' degli Studi di Milano-Bicocca,University of Milano-Bicocca
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- Yang, Jun, 1979 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- An, Tao (author)
- Guilin University of Electronic Technology,Chinese Academy of Sciences
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- Orienti, Monica (author)
- Istituto nazionale di astrofisica (INAF)
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- Ghirlanda, Giancarlo (author)
- Istituto Nazionale di Fisica Nucleare,National Institute for Nuclear Physics,Istituto nazionale di astrofisica (INAF)
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- Nava, Lara (author)
- Istituto Nazionale di Fisica Nucleare,National Institute for Nuclear Physics,Istituto nazionale di astrofisica (INAF)
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- Giroletti, M. (author)
- Istituto nazionale di astrofisica (INAF)
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- Mohan, Prashanth (author)
- Guilin University of Electronic Technology
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- Spinelli, Riccardo (author)
- Universita degli Studi dell'Insubria,University of Insubria,Istituto nazionale di astrofisica (INAF)
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- Zhang, Yingkang (author)
- Chinese Academy of Sciences
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- Marcote, Benito (author)
- Joint Institute for VLBI in Europe (JIVE)
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- Cimo, Giuseppe (author)
- Joint Institute for VLBI in Europe (JIVE)
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- Wu, Xuefeng (author)
- Chinese Academy of Sciences
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- Li, Zhixuan (author)
- Chinese Academy of Sciences
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(creator_code:org_t)
- 2022-05-27
- 2022
- English.
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In: Astrophysical Journal Letters. - : American Astronomical Society. - 2041-8213 .- 2041-8205. ; 931:2
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Abstract
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- We monitored the position of the close-by (about 370 Mpc) gamma-ray burst GRB 190829A, which originated from a massive star collapse, through very long baseline interferometry (VLBI) observations with the European VLBI Network and the Very Long Baseline Array, carrying out a total of nine observations between 9 and 117 days after the gamma-ray burst at 5 and 15 GHz, with a typical resolution of a few milliarcseconds. From a state-of-the art analysis of these data, we obtained valuable limits on the source size and expansion rate. The limits are in agreement with the size evolution entailed by a detailed modeling of the multiwavelength light curves with a forward-plus-reverse shock model, which agrees with the observations across almost 18 orders of magnitude in frequency (including the HESS data at TeV photon energies) and more than 4 orders of magnitude in time. Thanks to the multiwavelength, high-cadence coverage of the afterglow, inherent degeneracies in the afterglow model are broken to a large extent, allowing us to capture some unique physical insights; we find a low prompt emission efficiency of less than or similar to 10(-3), a low fraction of relativistic electrons in the forward shock downstream chi ( e ) < 13% (90% credible level), and a rapid decay of the magnetic field in the reverse shock downstream after the shock crossing. While our model assumes an on-axis jet, our VLBI astrometry is not sufficiently tight as to exclude any off-axis viewing angle, but we can exclude the line of sight to have been more than similar to 2 degrees away from the border of the gamma-ray-producing region based on compactness arguments.
Subject headings
- NATURVETENSKAP -- Fysik -- Acceleratorfysik och instrumentering (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Accelerator Physics and Instrumentation (hsv//eng)
- NATURVETENSKAP -- Fysik -- Subatomär fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Subatomic Physics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
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- art (subject category)
- ref (subject category)
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- By the author/editor
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Salafia, Om Shar ...
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Ravasio, Maria E ...
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Yang, Jun, 1979
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An, Tao
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Orienti, Monica
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Ghirlanda, Gianc ...
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show more...
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Nava, Lara
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Giroletti, M.
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Mohan, Prashanth
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Spinelli, Riccar ...
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Zhang, Yingkang
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Marcote, Benito
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Cimo, Giuseppe
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Wu, Xuefeng
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Li, Zhixuan
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Accelerator Phys ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Subatomic Physic ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
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Astrophysical Jo ...
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Chalmers University of Technology