[vsnet-grb-info 14488] GRB 140206A: TNG redshift confirmation
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Fri Feb 7 07:53:02 JST 2014
TITLE: GCN CIRCULAR
NUMBER: 15802
SUBJECT: GRB 140206A: TNG redshift confirmation
DATE: 14/02/06 22:52:54 GMT
FROM: Valerio D'Elia at ASDC <delia at 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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