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GRB 030227: The first multiwavelength afterglow of an INTEGRAL GRB

  • A.J. Castro-Tirado
  • , J. Gorosabel
  • , S. Guziy
  • , D. Reverte
  • , J.M.C. Ceron
  • , A.D. Postigo
  • , N. Tanvir
  • , S. Mereghetti
  • , A. Tiengo
  • , J. Buckle
  • , R. Sagar
  • , S.B. Pandey
  • , V. Mohan
  • , N. Masetti
  • , F. Mannucci
  • , S. Feltzing
  • , I. Lundstrom
  • , Henrik Pedersen
  • , C. Riess
  • , S. Trushkin
  • J. Vilchez, Niels Lund, Søren Brandt, S.M. Nunez, V. Reglero, M.D. Perez-Ramirez, S. Klose, J. Greiner, J. Hjorth, L. Kaper, E. Pian, E. Palazzi, M.I. Andersen, A. Fruchter, J.P.U. Fynbo, Bente Lundgård Jensen, C. Kouveliotou, J. Rhoads, E. Rol, P.M. Vreeswijk, R.A.M.J. Wijers, E. van den Heuvel

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    We present multiwavelength observations of a gamma-ray burst detected by INTEGRAL (GRB 030227) between 5.3 hours and similar to1.7 days after the event. Here we report the discovery of a dim optical afterglow (OA) that would not have been detected by many previous searches due to its faintess (R similar to 23). This OA was seen to decline following a power law decay with index alpha(R) = - 0.95 +/- 0.16. The spectral index beta(opt/NIR) yielded - 1.25 +/- 0.14. These values may be explained by a relativistic expansion of a fireball ( with p = 2.0) in the cooling regime. We also find evidence for inverse Compton scattering in X-rays.
    Original languageEnglish
    JournalAstronomy and Astrophysics
    Volume411
    Issue number1
    Pages (from-to)L315-L319
    ISSN0004-6361
    DOIs
    Publication statusPublished - 2003

    Keywords

    • gamma rays : bursts
    • techniques : photometric
    • cosmology : observations

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