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  Is spectral width a reliable measure of GRB emission physics?

Burgess, J. M. (2019). Is spectral width a reliable measure of GRB emission physics? Astronomy and Astrophysics, 629: A69. doi:10.1051/0004-6361/201935140.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-4577-8 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-4578-7
Genre: Journal Article

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Is spectral width a reliable measure of GRB emission physics.pdf (Any fulltext), 3MB
 
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Burgess, J. M.1, Author              
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1High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society, ou_159890              

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 Abstract: The spectral width and sharpness of unfolded, observed gamma-ray burst (GRB) spectra have been presented as a new tool to infer physical properties about GRB emission via spectral fitting of empirical models. Following the tradition of the “line-of-death”, the spectral width has been used to rule out synchrotron emission in a majority of GRBs. This claim is investigated via reexamination of previously reported width measures. Then, a sample of peak-flux GRB spectra are fit with an idealized, physical synchrotron model. It is found that many spectra can be adequately fit by this model even when the width measures would reject it. Thus, the results advocate for fitting a physical model to be the sole tool for testing that model. Finally, a smoothly-broken power law is fit to these spectra allowing for the spectral curvature to vary during the fitting process in order to understand why the previous width measures poorly predict the spectra. It is found that the failing of previous width measures is due to a combination of inferring physical parameters from unfolded spectra as well as the presence of multiple widths in the data beyond what the Band function can model.

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 Dates: 2019-09-06
 Publication Status: Published online
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 Identifiers: DOI: 10.1051/0004-6361/201935140
Other: LOCALID: 3179181
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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
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Publ. Info: France : EDP Sciences S A
Pages: - Volume / Issue: 629 Sequence Number: A69 Start / End Page: - Identifier: ISSN: 1432-0746
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1