INTEGRAL and XMM-Newton observations of the weak gamma-ray burst GRB 030227

S. Mereghetti, D. Gotz, A. Tiengo, V. Beckmann, J. Borkowski, T.J.L. Courvoisier, A. von Kienlin, V. Schoenfelder, J.P. Roques, L. Bouchet, P. Ubertini, A. Castro-Tirado, F. Lebrun, Joachim Paul, Niels Lund, J.M. Mas-Hesse, W. Hermsen, P.R. den Hartog, C. Winkler

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Abstract

We present International Gamma-Ray Astrophysical Laboratory ( INTEGRAL) and XMM-Newton observations of the prompt gamma-ray emission and the X-ray afterglow of GRB 030227, the first gamma-ray burst for which the quick localization obtained with the INTEGRAL Burst Alert System has led to the discovery of X-ray and optical afterglows. GRB 030227 had a duration of about 20 s and a peak flux of similar to1.1 photons cm(-2) s(-1) in the 20-200 keV energy range. The time-averaged spectrum can be fitted by a single power law with photon index similar to2, and we find some evidence for a hard-to-soft spectral evolution. The X-ray afterglow has been detected starting only 8 hr after the prompt emission, with a 0.2-10 keV flux decreasing as t(-1) from 1.3 x 10(-12) to 5 x 10(-13) ergs cm(-2) s(-1). The afterglow spectrum is well described by a power law with photon index modified by a 1.94 +/- 0.05 redshifted neutral absorber with column density of several 10(22) cm(-2). A possible emission line at 1.67 keV could be due to Fe for a redshift z similar to 3, consistent with the value inferred from the absorption.
Original languageEnglish
JournalAstrophysical Journal
Volume590
Issue number2
Pages (from-to)L73-L77
ISSN0004-637X
Publication statusPublished - 2003

Keywords

  • gamma rays : bursts
  • X-rays : general

Cite this

Mereghetti, S., Gotz, D., Tiengo, A., Beckmann, V., Borkowski, J., Courvoisier, T. J. L., von Kienlin, A., Schoenfelder, V., Roques, J. P., Bouchet, L., Ubertini, P., Castro-Tirado, A., Lebrun, F., Paul, J., Lund, N., Mas-Hesse, J. M., Hermsen, W., den Hartog, P. R., & Winkler, C. (2003). INTEGRAL and XMM-Newton observations of the weak gamma-ray burst GRB 030227. Astrophysical Journal, 590(2), L73-L77.