[vsnet-grb-info 13230] GRB 130505A - Gemini-N/GMOS redshift determination

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  14567
SUBJECT: GRB 130505A - Gemini-N/GMOS redshift determination
DATE:    13/05/05 10:30:19 GMT
FROM:    Nial Tanvir at U.Leicester  <nrt3 at star.le.ac.uk>

N. R. Tanvir (U. Leicester), A. J. Levan (U. Warwick), T. Matulonis
and A. B. Smith (Gemini) report on behalf of a larger collaboration:

We observed the afterglow of GRB 130505A (Cannizzo et al. GCN 14563)
with the GMOS-N spectrograph on Gemini-N, beginning approximately 60 min
after the BAT trigger.

In our provisional reduction we detect numerous absorption lines, including
Lyman alpha, SiII/SiII*1260, SiII*1264, OI1302, SiII/OI*1304, SiII*1309,
CII/CII* 1334/1335, SiIV1394/1403, SiII 1527, SiII* 1533, CIV 1548/1551,
FeII 1608, AlII 1671 and AlIII 1855/1863 at a common redshift of z=2.27.

The presence of fine structure lines, in particular, confirms this to be the
redshift of this burst.