Evidence for intrinsic absorption in the Swift X-ray afterglows

S. Campana, P. Romano, S. Covino, D. Lazzati, A. De Luca, G. Chincarini, A. Moretti, G. Tagliaferri, G. Cusumano, V. Mangano, V. La Parola, T. Mineo, P. Giommi, M. Perri, M. Capalbi, L. A. Antonelli, D. N. Burrows, J. E. Hill, J. L. Racusin, J. A. KenneaD. C. Morris, C. Pagani, J. A. Nousek, J. P. Osborne, M. R. Goad, K. L. Page, A. P. Beardmore, O. Godet, P. T. O'Brien, A. A. Wells, L. Angelini, N. Gehrels

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Gamma-ray burst (GRB) progenitors are observationally linked to the death of massive stars. X-ray studies of the GRB afterglows can deepen our knowledge of the ionization status and metal abundances of the matter in the GRB environment. Moreover, the presence of local matter can be inferred through its fingerprints in the X-ray spectrum, i.e. the presence of absorption higher than the Galactic value. A few studies based on BeppoSAX and XMM-Newton found evidence of higher than Galactic values for the column density in a number of GRB afterglows. Here we report on a systematic analysis of 17 GRBs observed by Swift up to April 15, 2005. We observed a large number of GRBs with an excess of column density. Our sample, together with previous determinations of the intrinsic column densities for GRBs with known redshift, provides evidence for a distribution of absorption consistent with that predicted for randomly occurring GRB within molecular clouds.

Original languageEnglish (US)
Title of host publicationGAMMA-RAY BURSTS IN THE SWIFT ERA
Subtitle of host publicationSixteenth Maryland Astrophysics Conference
Number of pages6
StatePublished - May 19 2006
EventGAMMA-RAY BURSTS IN THE SWIFT ERA: 16th Maryland Astrophysics Conference - Washington, D.C., United States
Duration: Nov 29 2005Dec 2 2005

Publication series

NameAIP Conference Proceedings
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616


OtherGAMMA-RAY BURSTS IN THE SWIFT ERA: 16th Maryland Astrophysics Conference
Country/TerritoryUnited States
CityWashington, D.C.

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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