GCN Circular 17523
Subject
GRB 150301B: X-shooter spectroscopy
Event
Date
2015-03-02T02:07:10Z (11 years ago)
From
Antonio de Ugarte Postigo at IAA-CSIC <deugarte@iaa.es>
A. de Ugarte Postigo (IAA-CSIC, DARK/NBI), T. Kruehler (ESO),
H. Flores (GEPI/Obs. de Paris), and J.P.U. Fynbo (DARK/NBI)
report on behalf of a larger collaboration:
We observed the afterglow of GRB 150301B (Lien et al. GCN 17515,
Buckley et al. GCN 17518, Kann et al. GCN 17522) with X-shooter at the
Very Large Telescope (Paranal Observatory, Chile). Observations started
at 00:45 UT (5.12 hr after the burst), and consisted of 6x600 s exposures
covering the spectral range between 3 000 and 18 000 Angstroms.
In the acquisition image the afterglow is detected with R(Vega) = 21.0 mag,
as compared to stars of the USNOB-1.0 catalogue.
On a preliminary reduction we detect a weak continuum with absorption
features of FeII, MgII and MgI at a common redshift of z = 1.5169, which
we suggest as the redshift of the GRB.
We acknowledge the excellent support provided by Paranal staff, and in
particular Andrea Mehner, Tayyaba Zafar, and Marcelo Lopez.