TITLE: GCN CIRCULAR NUMBER: 18973 SUBJECT: GRB 160131A: Optical observations from T150 OSN DATE: 16/02/02 15:12:35 GMT FROM: Antonio de Ugarte Postigo at IAA-CSIC A. de Ugarte Postigo (IAA-CSIC, DARK/NBI), C.C. Thoene (IAA-CSIC), V. Casanova (IAA-CSIC) and F. Aceituno (IAA-CSIC) report: We observed the afterglow of GRB 160131A (Page et al. GCN 18951) from the 1.5m telescope (T150), at Sierra Nevada Observatory (Granada, Spain) in two epochs on the first and second night after the GRB. In the first epoch we performed observations in the V, R and I filters and the object is well detected in all bands. During these observations on January 31.807 (10.8 hr after the burst), the object has a magnitude of R=17.90+/-0.02 (Vega), using as reference star the same USNO-B1.0 object mentioned in the circular by Xin et al. (GCN 18954). On the second night we performed photometry in 5 bands, U, B, V, R and I, the object is again detected in all bands. In an image with mean epoch February 1.835 (35.5 hr after the burst) we detect the object at R=19.83+/-0.03.