GRB 030227: the first multiwavelength afterglow of an INTEGRAL GRB
Astrophysics
2008-11-26 v1
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 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.
Keywords
Cite
@article{arxiv.astro-ph/0309804,
title = {GRB 030227: the first multiwavelength afterglow of an INTEGRAL GRB},
author = {A. J. Castro-Tirado and J. Gorosabel and S. Guziy and D. Reverte and J. M. Castro Cerón and A. de Ugarte Postigo and N. Tanvir and S. Mereghetti and A. Tiengo and J. Buckle and R. Sagar and S. B. Pandey and V. Mohan and N. Masetti and F. Mannucci and S. Feltzing and I. Lundstrom and H. Pedersen and C. Riess and S. Trushkin and J. Vilchez and N. Lund and S. Brandt and S. Martinez Nunez and V. Reglero and M. D. Perez-Ramirez and S. Klose and J. Greiner and J. Hjorth and L. Kaper and E. Pian and E. Palazzi and M. I. Andersen and A. Fruchter and J. P. U. Fynbo and B. L. Jensen and C. Kouveliotou and J. Rhoads and E. Rol and P. M. Vreeswijk and R. A. M. J. Wijers and E. van den Heuvel},
journal= {arXiv preprint arXiv:astro-ph/0309804},
year = {2008}
}
Comments
5 pages, 5 figures, accepted for publication in A&A