Astron. Astrophys. Suppl. Ser. 138, 487-488
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 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
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
Copyright The European Southern Observatory (ESO)