Journal Article

<i>XMM–Newton</i> and <i>Swift</i> observations prove GRB 090709A to be a distant, standard, long GRB

A. De Luca, P. Esposito, G. L. Israel, D. Götz, G. Novara, A. Tiengo and S. Mereghetti

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 402, issue 3, pages 1870-1876
Published in print March 2010 | ISSN: 0035-8711
Published online February 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2009.16012.x
XMM–Newton and Swift observations prove GRB 090709A to be a distant, standard, long GRB

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GRB 090709A is a long gamma-ray burst (GRB) discovered by Swift, featuring a bright X-ray afterglow as well as a faint infrared transient with very red and peculiar colours. The burst attracted a large interest because of a possible quasi-periodicity at P= 8.1 s in the prompt emission, suggesting that it could have a different origin with respect to standard, long GRBs. In order to understand the nature of this burst, we obtained a target of opportunity observation with XMM–Newton. X-ray spectroscopy, based on XMM–Newton and Swift data, allowed us to model the significant excess in photoelectric absorption with respect to the Galactic value as due to a large column density (∼6.5 × 1022 cm−2) in the GRB host, located at z∼ 4.2. Such a picture is also consistent with the infrared transient's properties. Re-analysis of the prompt emission, based on International Gamma-Ray Astrophysics Laboratory and on Swift data, excludes any significant modulation at P= 8.1 s. Thus, we conclude that GRB 090709A is a distant, standard, long GRB.

Keywords: gamma-rays: bursts; X-rays: bursts; X-rays: individual: GRB 090709A

Journal Article.  4722 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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