Jan-Erik Ovaldsen

Publications (2)6.02 Total impact

• Article: GRB 051022: Physical Parameters and Extinction of a Prototype Dark Burst

  Evert Rol, Alexander van der Horst, Klaas Wiersema, Sandeep K. Patel, Andrew Levan, Melissa Nysewander, Chryssa Kouveliotou, Ralph A. M. J. Wijers, Nial Tanvir, Dan Reichart, [......], Jan-Erik Ovaldsen, Andreas O. Jaunsen, Peter Jonker, Wilbert van Ham, Jens Hjorth, Rhaana L. C. Starling, Paul T. O'Brien, Johan Fynbo, David N. Burrows, and Richard Strom
  [show abstract] [hide abstract]
  ABSTRACT: GRB 051022 was undetected to deep limits in early optical observations, but precise astrometry from radio and X-rays showed that it most likely originated in a galaxy at z ≈ 0.8. We report radio, optical, near-infrared, and X-ray observations of GRB 051022. Using the available X-ray and radio data, we model the afterglow and calculate its energetics, finding it to be an order of magnitude lower than that of the prompt emission. The broadband modeling also allows us to precisely define various other physical parameters and the minimum required amount of extinction to explain the absence of an optical afterglow. Our observations suggest a high extinction, at least 2.3 mag in the infrared (J) and at least 5.4 mag in the optical (U) in the host-galaxy rest frame. Such high extinctions are unusual for GRBs and likely indicate a geometry where our line of sight to the burst passes through a dusty region in the host that is not directly colocated with the burst itself.
  The Astrophysical Journal 12/2008; 669(2):1098. · 6.02 Impact Factor
• Source

  Available from: Andreas O. Jaunsen

  Article: GRB051022: physical parameters and extinction of a prototype dark burst

  Evert Rol, Alexander van der Horst, Klaas Wiersema, Sandeep K. Patel, Andrew Levan, Melissa Nysewander, Chryssa Kouveliotou, Ralph A. M. J. Wijers, Nial Tanvir, Dan Reichart, [......], Jan-Erik Ovaldsen, Andreas O. Jaunsen, Peter Jonker, Wilbert van Ham, Jens Hjorth, Rhaana L. C. Starling, Paul T. O'Brien, Johan Fynbo, David N. Burrows, Richard Strom
  [show abstract] [hide abstract]
  ABSTRACT: GRB051022 was undetected to deep limits in early optical observations, but precise astrometry from radio and X-ray showed that it most likely originated in a galaxy at z~0.8. We report radio, optical, near infra-red and X-ray observations of GRB051022. Using the available X-ray and radio data, we model the afterglow and calculate the energetics of the afterglow, finding it to be an order of magnitude lower than that of the prompt emission. The broad-band modeling also allows us to precisely define various other physical parameters and the minimum required amount of extinction, to explain the absence of an optical afterglow. Our observations suggest a high extinction, at least 2.3 magnitudes in the infrared (J) and at least 5.4 magnitudes in the optical (U) in the host-galaxy restframe. Such high extinctions are unusual for GRBs, and likely indicate a geometry where our line of sight to the burst passes through a dusty region in the host that is not directly co-located with the burst itself.
  06/2007;