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. TrushkinJ. 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

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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 & 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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