TITLE: GCN CIRCULAR NUMBER: 11607 SUBJECT: GRB 110128A: VLT/X-shooter redshift DATE: 11/01/28 12:26:53 GMT FROM: Nial Tanvir at U.Leicester M. Sparre, A. de Ugarte Postigo, J. P. U. Fynbo , D. Malesani, B. Milvang-Jensen (Dark/NBI), S. D. Vergani, H. Flores (GEPI/Obs. de Paris), P. Goldoni (APC/Univ. Paris 7 and SAp/CEA), and N. R. Tanvir (U. Leicester) report on behalf of the X-shooter GRB GTO collaboration: We observed the optical afterglow of GRB 110128A (Grupe et al., GCN 11603; de Ugarte Postigo et al., GCN 11605) with the ESO VLT equipped with X-shooter. Observations lasted for two hours, with a mean time 2011 Jan 28.345 UT (6.55 hr after the GRB). Sky transparency was non optimal, but the seeing was around 0.9". We detect a broad damped Lyman alpha feature, and other absorption lines of OI, CII, SiIV, CIV, SiII and FeII at a common redshift of z=2.339.  We also find an absorption feature at about 4960A which we tentatively identify as an intervening CIV system at z=2.20. We acknowledge excellent support from the astronomers at the VLT, Dieter Nuernberger and Alvaro Alvarez.