Iron line afterglows: General constraints

Free access article

Issue		Astron. Astrophys. Suppl. Ser. Volume 138, Number 3, September 1999 Gamma-Ray Bursts in the Afterglow Era Contents Rome, November 3-6, 1998


Page(s)		545 - 546
DOI		http://dx.doi.org/10.1051/aas:1999346

DOI: 10.1051/aas:1999346

Astron. Astrophys. Suppl. Ser. 138, 545-546

G. Ghisellini¹ - D. Lazzati¹² - S. Campana¹

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

Received December 18, 1998; accepted March 26, 1999

Abstract:

The discovery of a powerful and transient iron line feature in the X-ray afterglow spectra of $\gamma$ -ray bursts would be a major breakthrough for understanding the nature of their progenitors, strongly suggesting the presence of a large, iron rich, mass in the vicinity of the burst event. Model-independent limits to the size and the mass of the the iron line emitting region are derived and discussed. We also discuss how these results can be used to constrain the amount of beaming or anisotropy of the burst emission.

Key words: gamma-rays: bursts -- supernovae: general -- X-rays: general

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