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GRB 030227: The first multiwavelength afterglow of an INTEGRAL GRB

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posted on 2012-10-24, 09:21 authored by A. J. Castro-Tirado, J. Gorosabel, S. Guziy, D. Reverte, De Ugarte Postigo A, J. Vílhez, Castro Cerón JM, A. Fruchter, J. Rhoads, N. Tanvir, S. Mereghetti, A. Tiengo, J. Buckle, R. Sagar, S. B. Pandey, V. Mohan, N. Masetti, E. Palazzi, F. Mannucci, S. Feltzing, I. Lundstrom, H. Pedersen, J. Hjorth, B. L. Jensen, C. Riess, S. Trushkin, N. Lund, S. Brandt, Martínez Núñez S, V. Reglero, M. D. Pérez-Ramírez, S. Klose, J. Greiner, R. A. M. J. Wijers, Van den Heuvel E, L. Kaper, E. Rol, E. Pian, M. I. Andersen, J. P. U. Fynbo, C. Kouveliotou, P. M. Vreeswijk
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 ( $R\sim 23$). This OA was seen to decline following a power law decay with index $\alpha_{R} = -0.95 \pm 0.16$. The spectral index $\beta_\mathrm{opt/NIR}$ yielded $-1.25 \pm 0.14$. 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.

History

Citation

Astronomy & Astrophysics, 2003, 411 (1)

Version

  • VoR (Version of Record)

Published in

Astronomy & Astrophysics

Publisher

EDP Sciences for European Southern Observatory (ESO)

issn

0004-6361

Copyright date

2003

Available date

2012-10-24

Publisher version

http://www.aanda.org/articles/aa/abs/2003/43/aaINTEGRAL21/aaINTEGRAL21.html

Language

en

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