GCN Circular 15802
Subject
GRB 140206A: TNG redshift confirmation
Date
2014-02-06T22:52:54Z (10 years ago)
From
Valerio D'Elia at ASDC <delia@asdc.asi.it>
V. D'Elia (INAF/OAR & ASI/ASDC), P. D'Avanzo, S. Covino, A. Melandri
(INAF-OAB), S. D. Vergani (CNRS/GEPI), L. Di Fabrizio (INAF/TNG)
report on behalf of the CIBO collaboration:
We report further observations of the field of GRB 140206A (Lien et
al., GCN 15784; Gotz et al., GCN 15785) with the Telescopio Nazionale
Galileo (TNG) equipped with DOLORES.
We obtained a spectrum of the optical source reported in D'Avanzo et
al. (GCN Circ. 15799), with a total exposure of 1800 s, using the
grism LR_B covering the wavelength range 3000 - 8000 AA. The
observation started at 2014-02-06T19:53:07, i.e., ~12.6 hrs after the
GRB.
We detect several absorption lines which we interpret as due to Ly-alpha,
NV, Si II, C II, SiIV, C IV, Al II, AlII and Fe II at a common
redshift of 2.74. In addition, we also detect at the same redshift
fine structure lines from excited levels of SiII and FeII, confirming
that this is the redshift of the GRB host galaxy. Our result is in
perfect agreement with the reported value by Malesani et al. (GCN 15800)
Finally, we also detect a strong intervening Ly-alpha absorber at z~2.32
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