[vsnet-grb-info 14650] GRB 140311A: NOT redshift confirmation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  15964
SUBJECT: GRB 140311A: NOT redshift confirmation
DATE:    14/03/12 13:37:59 GMT
FROM:    Valerio D'Elia at ASDC  <delia at asdc.asi.it>

P. D'Avanzo (INAF-OAB), V. D'Elia (INAF-OAR/ASI-ASDC), S. Piranomonte  
(INAF-OAR), A. Melandri (INAF-OAB), D. Malesani (DARK/NBI), T. Pursimo  
(NOT), M. C. Baglio, I. Andreoni (INAF-OAB) report on behalf of the  
CIBO collaboration:

Following the detection of the optical afterglow reported in D'Avanzo  
et al. (GCN 15953), we carried out optical spectroscopy of GRB 140311A  
(Racusin et al. GCN 15944) with the Nordic Optical Telescope (NOT)  
equipped with ALFOSC. The observation consisted of two 1800 s  
exposures covering the range between 3200 and 9100 A carried out at a  
mean t-t0=3.37 hours.

Despite the low SNR and a seeing of ~2, we detect broad absorption  
features at lambda ~ 7300 and 6100 AA which we interpret as Ly-alpha  
and Ly-beta at z ~ 5.

This is consistent with the redshift reported by Tanvir et al(GCN 15961).

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