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GCN Circular 23680

GRB 190114A: VLT/X-shooter redshift
2019-01-14T06:26:51Z (5 years ago)
Antonio de Ugarte Postigo at IAA-CSIC <>
A. de Ugarte Postigo (HETH/IAA-CSIC and DARK/NBI), 
N. R. Tanvir (U. Leicester), D. Xu (NAOC), JPU.Fynbo 
(DAWN/NBI and DAWN/DTU) report on behalf of the 
STARGATE Consortium:

We observed the optical counterpart of the Swift GRB 190114A 
(LaPorte et al. GCN 23677, Siegel et al. GCN 23678) with the 
ESO Very Large Telescope UT 2 (Kueyen) equipped with the 
X-shooter spectrograph, covering the wavelength range 
3500-24000 AA.  Observations started on 2019 Jan 14 03:25 UT
(approx 15 min after the GRB).

The spectrum exhibits many absorption features, including
Lya, SII, OI, OI*, SiII, SiII*, CII, CII*, NiII, SiIV, CIV, FeII, FeII*, 
AlII, AlIII, ZnII, MgII, MgI, and CaII at a common redshift of
z=3.3765. We conclude that this is the redshift of the GRB. We also 
identify an intervening system at a redshift of z=2.6232, characterised
by strong features due to MgII, FeII and AlII.

We acknowledge the expert support from the ESO observing
staff, in particular Elizabeth Bartlett, Trystyn Berg and Juan Carlos 
Olivares, and the visiting astronomer, Boris Gaensicke.
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