GCN Circular 14035
Subject
GRB 121201A: X-shooter redshift
Date
2012-12-02T05:43:10Z (11 years ago)
From
Antonio de Ugarte Postigo at IAA-CSIC <deugarte@iaa.es>
R. Sanchez-Ramirez (IAA-CSIC), A. de Ugarte Postigo (IAA-CSIC, DARK/NBI),
T. Kruehler (DARK/NBI), B. Milvang-Jensen (DARK/NBI), J.P.U. Fynbo (DARK/NBI),
N. Tanvir (U. Leicester), D. Malesani (DARK/NBI), S. Schulze (PUC & MCSS),
L. Kaper (U. Amsterdam), H. Flores (Obs. Paris) report on behalf of the X-shooter
GTO GRB collaboration,
We observed the afterglow of GRB121201A (Yeshov et al., GCN 14025, Kruehler
et al. GCN 14031) using the X-shooter spectrograph on the VLT (Paranal Observatory,
Chile). Observations consisted of 4x1200s exposures in the UVB and VIS arms and
8x600s exposures in the NIR, and started on 2 December 1:17 UT (12.87 hr after the
burst).
In a preliminary reduction we detect Ly-alpha in emission as well as several
absorption features (SiIV, CIV, AlII, AlIII) at a common redshift of z=3.385, which we
identify as the redshift of the GRB.
We acknowledge the excellent support of the VLT staff, in particular G. Carraro.