XMM-Newton and VLT observations of the afterglow of GRB040827

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dc.creatorDe Luca, A.
dc.creatorMelandri, A.
dc.creatorCaraveo, P. A.
dc.creatorGotz, D.
dc.creatorMereghetti, S.
dc.creatorTiengo, A.
dc.creatorAntonelli, L. A.
dc.creatorCampana, S.
dc.creatorChincarini, G.
dc.creatorCovino, S.
dc.creatorD'Avanzo, P.
dc.creatorFernandez-Soto, A.
dc.creatorFugazza, D.
dc.creatorMalesani, D.
dc.creatorStella, L.
dc.creatorTagliaferri, G.
dc.date2005-05-12
dc.date.accessioned2026-07-07T10:27:28Z
dc.date.available2026-07-07T10:27:28Z
dc.descriptionThe 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.
dc.description9 pages, 5 figures. Accepted for publication in Astronomy & Astrophysics
dc.identifierhttps://arxiv.org/abs/astro-ph/0505261
dc.identifierhttp://arxiv.org/abs/astro-ph/0505261
dc.identifierAstron.Astrophys.440:85-92,2005
dc.identifierdoi:10.1051/0004-6361:20052884
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/177161
dc.subjectAstrophysics
dc.titleXMM-Newton and VLT observations of the afterglow of GRB040827
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