INTEGRAL and XMM-Newton observations of the weak GRB 030227
Abstract
We present INTEGRAL and XMM-Newton observations of the prompt gamma-ray emission and the X-ray afterglow of GRB030227, the first GRB for which the quick localization obtained with the INTEGRAL Burst Alert System (IBAS) has led to the discovery of X-ray and optical afterglows. GRB030227 had a duration of about 20 s and a peak flux of 1.1 photons cm^-2 s^-1 in the 20-200 keV energy range. The time averaged spectrum can be fit by a single power law with photon index about 2 and we find some evidence for a hard to soft spectral evolution. The X-ray afterglow has been detected starting only 8 hours after the prompt emission, with a 0.2-10 keV flux decreasing as t^-1 from 1.3x10e-12 to 5x10e-13 erg cm^-2 s^-1. The afterglow spectrum is well described by a power law with photon index 1.94+/-0.05 modified by a redshifted neutral absorber with column density of several 10e22 cm^-2. A possible emission line at 1.67 keV could be due to Fe for a redshift z=3, consistent with the value inferred from the absorption.
Cite
@article{arxiv.astro-ph/0304477,
title = {INTEGRAL and XMM-Newton observations of the weak GRB 030227},
author = {S. Mereghetti and D. Gotz and A. Tiengo and V. Beckmann and J. Borkowski and T. J. -L. Courvoisier and A. von Kienlin and V. Schoenfelder and J. P. Roques and L. Bouchet and P. Ubertini and A. Castro-Tirado and F. Lebrun and J. Paul and N. Lund and M. Mas Hesse and W. Hermsen and P. den Hartog and C. Winkler},
journal= {arXiv preprint arXiv:astro-ph/0304477},
year = {2009}
}
Comments
16 pages, 5 figures, latex, Accepted for publication in The Astrophysical Journal Letters