[vsnet-grb-info 14836] GRB 140423A: Gemini-N redshift

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  16150
SUBJECT: GRB 140423A: Gemini-N redshift
DATE:    14/04/23 12:14:10 GMT
FROM:    Nial Tanvir at U.Leicester  <nrt3 at star.le.ac.uk>

N. R. Tanvir (U. Leicester), A. J. Levan (U. Warwick), K. Wiersema (U. Leicester),
A. Petric, K. Chiboucas, J. Miller (Gemini) report:

We observed the afterglow of GRB 140423A (Sonbas et al. GCN 16142;
Elenin et al. GCN 16143; Kaur et al. GCN 16144; Ferrante et al. GCN 16145;
Chester et al. GCN 16147) with the GMOS-N spectrograph on Gemini-N.
Observations began at 10:25 UT, approximately 1.9 hr post burst.

The spectra show absorption lines due to Ly-alpha, SiII (1251/1254),
SiII* (1265), OI (1302), SiII (1304), CII (1334), SiIV (1394/1403), 
SiII (1527), CIV (1548/1551) at a common redshift of z=3.26, which 
we infer is the redshift of the GRB.