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Hans Publishers, Astronomy & Astrophysics, 1(411), p. L315-L319

DOI: 10.1051/0004-6361:20031393

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GRB 030227: The first multiwavelength afterglow of an INTEGRAL GRB

Journal article published in 2003 by A. de Ugarte Postigo, Aj J. Castro-Tirado, J. Gorosabel, S. Guziy, D. Reverte ORCID, J. M. Castro Cerón, A. de Ugarte Postigo, J. M. Castro Cerón, A. U. De Postigo, N. R. Tanvir, S. Mereghetti, A. de Ugarte Postigo, A. Tiengo ORCID, J. Buckle, R. Sagar and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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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 αR = −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. ; Martinez Nuñez, Silvia, Silvia.Martinez@uv.es ; Reglero Velasco, Victor, Victor.Reglero@uv.es