TITLE: GCN CIRCULAR NUMBER: 20472 SUBJECT: GRB 170112A : AbAO optical observations DATE: 17/01/16 19:35:42 GMT FROM: Alexei Pozanenko at IKI, Moscow E. Mazaeva (IKI), A. Pozanenko (IKI), R. Inasaridze (AbAO), A. Volnova (IKI), V. Ayvazian (AbAO), O.Kvaratskhelia (AbAO), G. Inasaridze (AbAO), I. Molotov (KIAM), report on behalf of larger GRB follow-up collaboration: We observed the field of short GRB 170112A (Mingo et al., GCN 20436) with AS-32 (0.7m) telescope of Abastumani Observatory on Jan., 12 (UT) 15:35:30. We obtained several unfiltered images of the field. Within BAT error circle (Mingo et al., GCN 2043) we found the source which is absent in USNO-B1.0 at coordinates (J2000) 01:00:49.80 -17:10:17.5 with uncertainty of 0.9 arcsec in both coordinates. Finding chart can be found at http://grb.rssi.ru/GRB170112A/GRB170112A_AAO_170112.png The source is barely visible in DSS2 (R). Preliminary photometry of the source is following Date UT start t-T0 Filter Exp. OT Err UpLim (3 sigma) (mid, days) (s) 2017-01-12 15:35:30 0.61446 CR 47*60 17.50 0.25 17.7 Photometry is based on nearby USNO-B1.0 stars USNO-B.1_id R2 0727-0016063 14.46 0728-0016765 15.73 0728-0016759 12.78 0728-0016802 14.33 The source above does not match any source of XRT observation (D'Ai et al., GCN 20440), see also http://www.swift.ac.uk/ToO_GRBs/00732188/