Volume 432, Number 2, March III 2005
|Page(s)||467 - 473|
|Published online||02 March 2005|
INTEGRAL and XMM-Newton observations of GRB 040106*
Department of Experimental Physics, University College Dublin, Dublin 4, Ireland
2 School of Physics and Astronomy, University of Southampton, Southampton, UK e-mail: email@example.com
3 Istituto di Astrofisica Spaziale e Fisica Cosmica - CNR, via Bassini 15, 20133 Milano, Italy
4 Max-Planck-Institut für extraterrestrische Physik, 85748 Garching, Germany
5 Department of Physics, University of Alabama at Huntsville, USA
6 Science Operations and Data Systems Division of ESA/ESTEC,SCI-SDG, 2200 AG Noordwijk, The Netherlands
7 Space and Remote Sensing Sciences, Los Alamos National Laboratory, USA
Accepted: 15 November 2004
On January 6th 2004, the IBAS burst alert system triggered the 8th gamma-ray burst (GRB) to be located by the INTEGRAL satellite. The position was determined and publicly distributed within 12 s, prompting ESA's XMM-Newton to execute a ToO observation just 5 h later, during which an X-ray afterglow was detected. The GRB had a duration ~52 s with two distinct pulses separated by ~42 s. Here we present the results of imaging and spectral analyses of the prompt emission from INTEGRAL data and the X-ray afterglow from XMM-Newton data. The γ-ray spectrum is consistent with a single power-law of photon index -1.72 ± 0.15. The fluence (20–200 keV) was 8.2 10-7 erg cm-2. The X-ray afterglow () was extremely hard with ± 0.01 and ± 0.04. The 2–10 keV flux 11 h after the burst was 1.1 10-12 erg cm-2 s-1. The time profile of the GRB is consistent with the observed trends from previous analysis of BATSE GRBs. We find that the X-ray data are not well-fit by either a simple spherical fireball or by a speading jet, expanding into a homogeneous medium or a wind environment. Based on previously determined correlations between GRB spectra and redshift, we estimate a redshift of ~0.9 (1σ) and a lower limit on the isotropic radiated energy of ~5 1051 erg in this burst.
Key words: gamma-rays: bursts / gamma-rays: observations
© ESO, 2005
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