Z.P. Zhu, D. Xu, Y. Wang, J.B. Zhang (NAOC), J.H. Liu, X. Zhang (XAO)
We observed the optical afterglow of GRB 190106A (Sonbas et al., GCN
23615) using the Xinglong-2.16m telescope equipped with BFOSC. We
acquired 1x3600 s and then 1x2400 s spectra starting at 14:02:39 UT on
2019-01-06, i.e., 27.9 mins after the burst. The optical afterglow was
R~16 mag at this time.
From preliminary analysis, a continuum is detected across the spectral
range of 3600 - 9000 AA. A few absorption features are also detected due
to Fe II, Al II, Mn II, Mg II doublet, and Mg I, at a redshift of
z~0.896, which we propose as the likely redshift of the GRB.