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. Trushkin, J. Vilchez, N. Lund, S. Brandt, S. Martinez 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, B. L. Jensen, C. Kouveliotou, J. Rhoads, E. Rol, P. M. Vreeswijk, R. A. M. J. Wijers, E. van den Heuvel
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 AlphaR= -0.95 +/- 0.16. The spectral index Betaopt/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.
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