[vsnet-grb-info 15197] GRB 140629A: BTA redshift

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  16489
SUBJECT: GRB 140629A: BTA redshift
DATE:    14/06/30 02:08:02 GMT
FROM:    Rodion Burenin at IKI, Moscow  <rodion at hea.iki.rssi.ru>

A. Moskvitin (SAO-RAS, N. Arkhyz), R. Burenin (IKI, Moscow),
R. Uklein, V. Sokolov (SAO-RAS, N. Arkhyz), R. Sanchez-Ramirez,
J. Gorosabel and A. J. Castro-Tirado (IAA-CSIC, Granada), on behalf of
a larger collaboration, report:

Following the detection of GRB 140629A by Swift (Lien et al. GCNC
16477), we observed the optical counterpart (Lien et al., GCNC 16477,
Yurkov et al. GCNC 16478) with the 6-m BTA (+Scorpio-I) on June 29,
starting 4.1 hours after the event. We obtained 43.6 minutes of
spectral data in the range 4000-9800A and resolution FWHM = 13A. The
optical afterglow spectrum shows prominent absorption lines which we
interpret as AlIII, CIV, CII, FeII, MgII, SiIV at the redshift 
z = 2.275 +/- 0.003. We suggest this to be the redshift to GRB
140629A.