Probing the warm Inter-Galactic Medium through absorption against Gamma Ray Bursts X-ray afterglows

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GRB afterglows close to their peak intensity are among the brightest X-ray sources in the sky. When fluxes are integrated from minutes up to hours after the GRB the corresponding logN-logF exceeds that of any other z>0.5 source. We discuss how to use X-ray afterglows as beacons to probe the warm logT=5-7K IGM in filaments and outskirts of clusters of galaxies by means of absorption features, the ``X-ray forest''. The Chandra and XMM-Newton spectrometers can detect it along most GRBs' lines of sight, provided afterglows are observed within 2-4 hours after the burst. A dedicated medium-sized X-ray telescope with pointing capabilities similar to that of Swift and spectral resolution >300 would be well suited to exploit the new diagnostic and study the physical conditions in the Universe at the critical moment when structure is being formed.

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