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Bayesian Time-resolved Spectroscopy of GRB Pulses
KTH, School of Engineering Sciences (SCI), Physics. Univ Hong Kong, Fac Sci, Pokfulam, Hong Kong, Peoples R China..ORCID iD: 0000-0001-5643-7445
KTH, School of Engineering Sciences (SCI), Physics. Max Planck Inst Extraterr Phys, Giessenbachstr 1, D-85748 Garching, Germany..
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0002-9769-8016
2019 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 886, no 1, article id 20Article in journal (Refereed) Published
Abstract [en]

We 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, ?, 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, ?. For these 38 spectra, we find that 60% of the ? 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 ? and the energy flux is similar for most of the pulses, independent of any evolution of the other parameters.

Place, publisher, year, edition, pages
Institute of Physics (IOP), 2019. Vol. 886, no 1, article id 20
Keywords [en]
catalogs, gamma-ray burst: general, methods: statistical
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-265464DOI: 10.3847/1538-4357/ab488aISI: 000499347600001Scopus ID: 2-s2.0-85077333717OAI: oai:DiVA.org:kth-265464DiVA, id: diva2:1379643
Note

QC 20191217

Available from: 2019-12-17 Created: 2019-12-17 Last updated: 2020-02-04Bibliographically approved

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Yu, Hoi-FungRyde, Felix

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