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  1. No Access

    Article

    Multidimensional analysis of Fermi GBM gamma-ray bursts

    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 statist...

    I. Horváth, J. Hakkila, Z. Bagoly, L. V. Tóth, I. I. Rácz… in Astrophysics and Space Science (2019)

  2. No Access

    Article

    Classifying GRB 170817A/GW170817 in a Fermi duration–hardness plane

    GRB 170817A, associated with the LIGO-Virgo GW170817 neutron-star merger event, lacks the short duration and hard spectrum of a Short gamma-ray burst (GRB) expected from long-standing classification models. Co...

    I. Horváth, B. G. Tóth, J. Hakkila, L. V. Tóth… in Astrophysics and Space Science (2018)

  3. No Access

    Article

    Selection effects and tests of repetition (clustering) in the BATSE 1B catalog

    A “repeater statistic” (derived from the two-point angular correlation function and accounting for location errors) is used to identify constraints on the rate of burst repetition from the BATSE 1B catalog. Be...

    J. Hakkila, V. Vo, C. Meegan, J. Horack, G. Fishman… in Astrophysics and Space Science (1995)

  4. No Access

    Article

    Constraints on the luminosities of gamma-ray bursts

    Constraints are found on the gamma-ray burst luminosity function from an analysis of the combined BATSE/PVO intensity distribution. If bursts originate in an extended Galactic halo, then the intrinsic luminosi...

    J. Hakkila, C. Meegan, J. Horack, G. Pendleton, M. Briggs… in Astrophysics and Space Science (1995)

  5. No Access

    Article

    Are galactic GRB models still an option?

    The traditional paradigm of a Galactic origin of gamma-ray bursts (GRBs) suffered a major reduction in popularity when BATSE revealed an isotropic but radially inhomogeneous distribution of GRBs. The lack of p...

    D. H. Hartmann, M. S. Briggs, G. N. Pendleton, J. Hakkila in Astrophysics and Space Science (1995)

  6. No Access

    Chapter and Conference Paper

    Multifactorial Intervention Program After Acute Myocardial Infarction

    In 1973, a project consisting of a rehabilitation and secondary prevention program was started in several European centers coordinated by the Regional Office for Europe of the WHO. The project was based on sev...

    V. Kallio, Helena Hämäläinen, O. J. Luurila… in Primary and Secondary Prevention of Corona… (1985)