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GCN Circular 20078

GRB 161017A: TNG spectroscopy and redshift confirmation
2016-10-18T20:02:16Z (8 years ago)
Paolo D'Avanzo at INAF-OAB <>
P. D'Avanzo (INAF-OAB), D. Malesani (DARK/NBI and DTU Space), 
V. D'Elia (INAF/OAR & ASI/ASDC), A. Melandri (INAF-OAB), V. Lorenzi, 
H. Stoev (INAF-TNG) report on behalf of the CIBO collaboration: 

We observed the optical afterglow of GRB 161017A (Yurkov et al. GCN 20063; 
Troja et al. GCN 20064; de Ugarte Postigo et al. GCN 20069; Fujiwara et al. 
GCN 20070; Guidorzi et al. GCN 20072; Breeveld & Troja, GCN 20074; Sadovnichy 
et al. GCN 20075) with the 3.6m Telescopio Nazionale Galileo (TNG) equipped 
with the DOLoRes camera in spectroscopic mode. Observations were carried out 
with the LR-B filter, covering the range 3500-8000 AA. The observations consisted of 
two spectra, each one lasting 1200 s, carried out at a mean time of Oct 18.1852 UT 
(~10.58 hours after the burst). 

The spectrum shows a clear continuum. We detect absorption features consistent 
with Li-alpha, Si II, C IV and Fe II lines at a common redshift of z = 2.01, together
with MgII intervening systems at z=0.92 and z=1.37, in agreement with the results 
reported by de Ugarte Postigo et al. (GCN 20069) and Castro-Tirado et al. (GCN 20077).
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