Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-05-12
Astron.Astrophys.440:85-92,2005
Astronomy and Astrophysics
Astrophysics
9 pages, 5 figures. Accepted for publication in Astronomy & Astrophysics
Scientific paper
10.1051/0004-6361:20052884
The field of the Gamma-Ray Burst GRB 040827 was observed with XMM-Newton and with the ESO/VLT starting ~6 and ~12 hours after the burst, respectively. A fading X-ray afterglow is clearly detected with the XMM-Newton/EPIC instrument, with a time decay t^(-delta), with delta=1.41+/-0.10. Its spectrum is well described by a power law (photon index Gamma=2.3+/-0.1) affected by an absorption largely exceeding (by a factor ~5) the expected Galactic one, requiring the contribution of an intrinsic, redshifted absorber. In the optical/NIR range, the afterglow emission was observed in the Ks band, as a weak source superimposed to the host galaxy, with magnitude Ks=19.44+/-0.13 (12 hours after the GRB, contribution from the host subtracted); in other bands the flux is dominated by the host galaxy. Coupling constraints derived from X-ray spectral fitting and from photometry of the host, we estimated a gas column density in the range (0.4-2.6)x10^22 cm^-2 in the GRB host galaxy, likely located at a redshift 0.5
Antonelli Lucio Angelo
Campana Sergio
Caraveo Patricia A.
Chincarini Guido
Covino Stefano
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