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Astron. Astrophys. Suppl. Ser. 138, 487-488

GRB redshift determination in the X-ray band

S. Campana1 - G. Ghisellini1 - D. Lazzati1,2 - F. Haardt3 - S. Covino1

1 - Osservatorio Astronomico di Brera, Via Bianchi 46, I-23807 Merate (Lc), Italy
2 - Dipartimento di Fisica, Università degli Studi di Milano, Via Celoria 16, I-20133 Milano, Italy
3 - Dipartimento di Fisica dell'Università di Como, via Lucini 3, I-22100 Como, Italy

Received December 29, 1998; accepted June 23, 1999


If $\gamma-$ray bursts originate in dense stellar forming regions, the interstellar material can imprint detectable absorption features on the observed X-ray spectrum. Such features can be detected by existing and planned X-ray satellites, as long as the X-ray afterglow is observed after a few minutes from the burst. Detection of these X-ray features will make possible the determination of the redshift of $\gamma-$ray bursts even when their optical afterglows are severely dimmed by extinction. For further detail see Ghisellini et al. (1999).

Key words: gamma-rays: bursts -- X-rays: general -- line: formation

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