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GCN Circular 16489

Subject
GRB 140629A: BTA redshift
Date
2014-06-30T02:08:02Z (10 years ago)
From
Rodion Burenin at IKI, Moscow <rodion@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.
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