TITLE:   GCN CIRCULAR
NUMBER:  15310
SUBJECT: GRB131004A: TNG Redshift confirmation
DATE:    13/10/05 09:32:49 GMT
FROM:    Valerio D'Elia at ASDC  <delia@asdc.asi.it>

V. D'Elia (INAF-OAR/ASDC), P. D'Avanzo (INAF-OAB), D. Malesani (DARK/NBI),
L. di Fabrizio, G. Tessicini (INAF-TNG) report on behalf of the CIBO
collaboration:


We observed the optical afterglow (Xu et al., GCN 15304; Malesani et  
al., GCN 15305; Kopac et al., GCN 15306) of the possible short GRB  
131004A (Hagen et al., GCN 15303) using DOLORES/LR-B (wavelength  
range: 3000-8000 AA) on the 4-m TNG Telescope at Canary islands. We  
obtain a 1800 s spectrum starting at 2013-10-04 23:00:38 UT, i.e.,  
1.33 hr from the burst.

A preliminary reduction reveals weak emission lines from [O II],  
H-gamma and H-delta at a common redshift of 0.71.

We thus confirm the redshift reported by Chornock et al. (GCN 15307).

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