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XMM-Newton and VLT observations of the afterglow of GRB040827

By SpaceRef Editor
July 9, 2005
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Astrophysics, abstract

From: Andrea De Luca [view email]
Date: Thu, 12 May 2005 15:54:13 GMT (56kb)

XMM-Newton and VLT observations of the afterglow of GRB040827

A. De Luca,
A. Melandri,
P.A. Caraveo,
D. Gotz,
S. Mereghetti,
A. Tiengo,
L.A. Antonelli,
S. Campana,
G. Chincarini,
S. Covino,
P. D’Avanzo,
A. Fernandez-Soto,
D. Fugazza,
D. Malesani,
L. Stella,
G. Tagliaferri

Comments: 9 pages, 5 figures. Accepted for publication in Astronomy &

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<z<1.7. GRB 040827 stands out as the best example of
an X-ray afterglow with intrinsic absorption.

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