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Issue A&A Volume 444, Number 2, December III 2005 Page(s) 425 - 430 Section Extragalactic astronomy DOI 10.1051/0004-6361:20053773

A&A 444, 425-430 (2005)
DOI: 10.1051/0004-6361:20053773

The host of GRB/XRF 030528 - an actively star forming galaxy at z = 0.782

A. Rau, M. Salvato and J. Greiner

Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse, 85748 Garching, Germany
    e-mail: arau@mpe.mpg.de

(Received 6 July 2005 / Accepted 11 August 2005)

Abstract
An important parameter for the distinction of X-ray flashes, X-ray rich bursts and Gamma-ray bursts in the rest frame is the distance to the explosion site. Here we report on the spectroscopic redshift determination of the host galaxy of XRF/GRB 030528 using the ESO VLT FORS2 instrument. From the strong oxygen and hydrogen emission lines the redshift was measured to be . Obtaining the line luminosities and ratios we find that the host is consistent with being an actively star forming galaxy with sub-solar metallicity. With a stellar mass of ~10¹⁰ the host is placed among the most massive GRB host galaxies at a similar redshift. Estimating the redshifted properties of the prompt emission, we find that XRF/GRB 030528 would be classified as an X-ray rich burst in the rest frame rather than an X-ray flash in the typically-used observer frame.

Key words: gamma rays: bursts

SIMBAD Objects

© ESO 2005

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