GRB 030227: The first multiwavelength afterglow of an INTEGRAL GRB

A. J. Castro-Tirado*, J. Gorosabel, S. Guziy, D. Reverte, J. M. Castro Cerón, A. De Ugarte Postigo, N. Tanvir, S. Mereghetti, A. Tiengo, J. Buckle, R. Sagar, S. B. Pandey, V. Mohan, N. Masetti, F. Mannucci, S. Feltzing, I. Lundstrom, H. Pedersen, C. Riess, S. TrushkinJ. Vílhez, N. Lund, S. Brandt, S. Martínez Núñez, V. Reglero, M. D. Pérez-Ramírez, S. Klose, J. Greiner, J. Hjorth, L. Kaper, E. Pian, E. Palazzi, M. I. Andersen, A. Fruchter, J. P.U. Fynbo, B. L. Jensen, C. Kouveliotou, J. Rhoads, E. Rol, P. M. Vreeswijk, R. A.M.J. Wijers, E. Van den Heuvel

*Corresponding author for this work

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18 Citations (Scopus)

Abstract

We present multiwavelength observations of a gamma-ray burst detected by INTEGRAL (GRB 030227) between 5.3 hours and ∼ 1.7 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 ∼ 23). This OA was seen to decline following a power law decay with index α R = -0.95 ± 0.16. The spectral index βopt/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 - 1 Nov 2003

Keywords

  • Cosmology: observations
  • Gamma rays: bursts
  • Techniques: photometric

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