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Article: Bayesian Time-Resolved Spectroscopy of GRB Pulses

TitleBayesian Time-Resolved Spectroscopy of GRB Pulses
Authors
KeywordsCatalogs-gamma-ray burst
Figure sets
General-methods
Machine-readable table
Statistical supporting material
Issue Date2019
PublisherAmerican Astronomical Society, co-published with Institute of Physics Publishing, Inc. The Journal's web site is located at http://iopscience.iop.org/0004-637X/
Citation
The Astrophysical Journal, 2019, v. 886 n. 1, p. article no. 20 How to Cite?
AbstractWe performed time-resolved spectroscopy on a sample of 38 single pulses from 37 gamma-ray bursts detected by the Fermi/Gamma-ray Burst Monitor during the first 9 yr of its mission. For the first time a fully Bayesian approach is applied. A total of 577 spectra are obtained and their properties studied using two empirical photon models, namely the cutoff power law (CPL) and Band model. We present the obtained parameter distributions, spectral evolution properties, and parameter relations. We also provide the result files containing this information for usage in further studies. It is found that the CPL model is the preferred model, based on the deviance information criterion and the fact that it consistently provides constrained posterior density maps. In contrast to previous works, the high-energy power-law index of the Band model, β, has in general a lower value for the single pulses in this work. In particular, we investigate the individual spectrum in each pulse, that has the largest value of the low-energy spectral indexes, α. For these 38 spectra, we find that 60% of the α values are larger than −2/3, and thus incompatible with synchrotron emission. Finally, we find that the parameter relations show a variety of behaviors. Most noteworthy is the fact that the relation between α and the energy flux is similar for most of the pulses, independent of any evolution of the other parameters.
Persistent Identifierhttp://hdl.handle.net/10722/285025
ISSN
2019 Impact Factor: 5.745
2015 SCImago Journal Rankings: 3.266

 

DC FieldValueLanguage
dc.contributor.authorYu, HF-
dc.contributor.authorDereli-Bégué, H-
dc.contributor.authorRyde, F-
dc.date.accessioned2020-08-07T09:05:45Z-
dc.date.available2020-08-07T09:05:45Z-
dc.date.issued2019-
dc.identifier.citationThe Astrophysical Journal, 2019, v. 886 n. 1, p. article no. 20-
dc.identifier.issn0004-637X-
dc.identifier.urihttp://hdl.handle.net/10722/285025-
dc.description.abstractWe performed time-resolved spectroscopy on a sample of 38 single pulses from 37 gamma-ray bursts detected by the Fermi/Gamma-ray Burst Monitor during the first 9 yr of its mission. For the first time a fully Bayesian approach is applied. A total of 577 spectra are obtained and their properties studied using two empirical photon models, namely the cutoff power law (CPL) and Band model. We present the obtained parameter distributions, spectral evolution properties, and parameter relations. We also provide the result files containing this information for usage in further studies. It is found that the CPL model is the preferred model, based on the deviance information criterion and the fact that it consistently provides constrained posterior density maps. In contrast to previous works, the high-energy power-law index of the Band model, β, has in general a lower value for the single pulses in this work. In particular, we investigate the individual spectrum in each pulse, that has the largest value of the low-energy spectral indexes, α. For these 38 spectra, we find that 60% of the α values are larger than −2/3, and thus incompatible with synchrotron emission. Finally, we find that the parameter relations show a variety of behaviors. Most noteworthy is the fact that the relation between α and the energy flux is similar for most of the pulses, independent of any evolution of the other parameters.-
dc.languageeng-
dc.publisherAmerican Astronomical Society, co-published with Institute of Physics Publishing, Inc. The Journal's web site is located at http://iopscience.iop.org/0004-637X/-
dc.relation.ispartofThe Astrophysical Journal-
dc.subjectCatalogs-gamma-ray burst-
dc.subjectFigure sets-
dc.subjectGeneral-methods-
dc.subjectMachine-readable table-
dc.subjectStatistical supporting material-
dc.titleBayesian Time-Resolved Spectroscopy of GRB Pulses-
dc.typeArticle-
dc.identifier.emailYu, HF: davidyu@hku.hk-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.3847/1538-4357/ab488a-
dc.identifier.scopuseid_2-s2.0-85077333717-
dc.identifier.hkuros312635-
dc.identifier.volume886-
dc.identifier.issue1-
dc.identifier.spagearticle no. 20-
dc.identifier.epagearticle no. 20-
dc.publisher.placeUnited States-

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