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  A reverse shock in GRB 181201A

Laskar, T., van Eerten, H., Schady, P., Mundell, C. G., Alexander, K. D., Duran, R. B., et al. (2019). A reverse shock in GRB 181201A. The Astrophysical Journal, 884(2): 121. doi:10.3847/1538-4357/ab40ce.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-860D-6 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-860E-5
Genre: Journal Article

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 Creators:
Laskar, Tanmoy, Author
van Eerten, Hendrik, Author
Schady, Patricia, Author
Mundell, C. G., Author
Alexander, Kate D., Author
Duran, Rodolfo Barniol, Author
Berger, Edo, Author
Bolmer, J.1, Author              
Chornock, Ryan, Author
Coppejans, Deanne L., Author
Fong, Wen-fai, Author
Gomboc, Andreja, Author
Jordana-Mitjans, Núria, Author
Kobayashi, Shiho, Author
Margutti, Raffaella, Author
Menten, Karl M., Author
Sari, Re’em, Author
Yamazaki, Ryo, Author
Lipunov, V. M., Author
Gorbovskoy, E., Author
Kornilov, V. G., AuthorTyurina, N., AuthorZimnukhov, D., AuthorPodesta, R., AuthorLevato, H., AuthorBuckley, D. A. H., AuthorTlatov, A., AuthorRebolo, R., AuthorSerra-Ricart, M., Author more..
Affiliations:
1High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society, ou_159890              

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 Abstract: We present comprehensive multiwavelength radio to X-ray observations of GRB 181201A spanning from ≈150 s to ≈163 days after the burst, comprising the first joint ALMA–VLA–GMRT observations of a gamma-ray burst (GRB) afterglow. The radio and millimeter-band data reveal a distinct signature at ≈3.9 days, which we interpret as reverse-shock (RS) emission. Our observations present the first time that a single radio-frequency spectral energy distribution can be decomposed directly into RS and forward shock (FS) components. We perform detailed modeling of the full multiwavelength data set, using Markov Chain Monte Carlo sampling to construct the joint posterior density function of the underlying physical parameters describing the RS and FS synchrotron emission. We uncover and account for all discovered degeneracies in the model parameters. The joint RS–FS modeling reveals a weakly magnetized (σ ≈ 3 × 10−3), mildly relativistic RS, from which we derive an initial bulk Lorentz factor of Γ0 ≈ 103 for the GRB jet. Our results support the hypothesis that low-density environments are conducive to the observability of RS emission. We compare our observations to other events with strong RS detections and find a likely observational bias selecting for longer lasting, nonrelativistic RSs. We present and begin to address new challenges in modeling posed by the present generation of comprehensive, multifrequency data sets.

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 Dates: 2019-10-17
 Publication Status: Published online
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 Identifiers: DOI: 10.3847/1538-4357/ab40ce
Other: LOCALID: 3188329
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Title: The Astrophysical Journal
Source Genre: Journal
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Publ. Info: Bristol; Vienna : IOP Publishing; IAEA
Pages: - Volume / Issue: 884 (2) Sequence Number: 121 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3