SIMBAD references

2005A&A...440...85D - Astronomy and Astrophysics, volume 440, 85-92 (2005/9-2)

XMM-Newton and VLT observations of the afterglow of GRB 040827.

DE LUCA A., MELANDRI A., CARAVEO P.A., GOETZ D., MEREGHETTI S., TIENGO A., ANTONELLI L.A., CAMPANA S., CHINCARINI G., COVINO S., D'AVANZO P., FERNANDEZ-SOTO A., FUGAZZA D., MALESANI D., STELLA L. and TAGLIAFERRI G.

Abstract (from CDS):

The field of the Gamma-Ray Burst GRB 040827 was observed with XMM-Newton and with the ESO/VLT starting ∼6 and ∼12h after the burst, respectively. A fading X-ray afterglow is clearly detected with the XMM-Newton/EPIC instrument, with a time decay t–δ, with δ=1.41±0.10. Its spectrum is well described by a power law (photon index Γ=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 on the host galaxy, with magnitude Ks=19.44±0.13 (12h 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)x1022cm–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.

Abstract Copyright:

Journal keyword(s): gamma rays: bursts - X-rays: general

Simbad objects: 14

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2020.09.30-01:57:01

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