Multidimensional analysis of Fermi GBM gamma-ray bursts

I. Horváth, J. Hakkila, Z. Bagoly, L. Tóth, I. I. Rácz, S. Pintér, B. G. Tóth

Research output: Contribution to journalArticle


The Fermi GBM catalog provides a large database with many measured variables that can be used to explore and verify gamma-ray burst classification results. We have used Principal Component Analysis and statistical clustering techniques to look for clustering in a sample of 801 gamma-ray bursts described by sixteen classification variables. The analysis recovers what appears to be the Short class and two long-duration classes that differ from one another via peak flux, with negligible variations in fluence, duration and spectral hardness. Neither class has properties entirely consistent with the Intermediate GRB class. Spectral hardness has been a critical Intermediate class property. Rather than providing spectral hardness, Fermi GBM provides a range of fitting variables for four different spectral models; it is not intuitive how these variables can be used to support or disprove previous GRB classification results.

Original languageEnglish
Article number105
JournalAstrophysics and Space Science
Issue number6
Publication statusPublished - Jun 1 2019


  • Astronomical databases: miscellaneous
  • Cosmology: miscellaneous
  • Cosmology: observations
  • Gamma-ray burst: general
  • Gamma-rays: general
  • Gamma-rays: observations
  • Gamma-rays: theory
  • Methods: data analysis
  • Methods: statistical

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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