TITLE: GCN CIRCULAR NUMBER: 17915 SUBJECT: GRB150607A: AAO and CrAO optical observations DATE: 15/06/08 17:49:29 GMT FROM: Alexei Pozanenko at IKI, Moscow E. Mazaeva (IKI), R. Inasaridze (AAO), S. Nazarov (CrAO), Sh. Makandarashvili (AAO), A. Volnova (IKI), I. Molotov (KIAM), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration: We observed the field of GRB 150607A (Swift trigger 642620, D'Elia et al., GCN 17904) with the AS-32 (0.7m) telescope of Abastumani Observatory (AAO) starting on June, 07 17:54:22, and with AZT-8 telescope of CrAO starting on June, 07 19:43:21. The afterglow of GRB 150607A (Kruehler et al., GCN 17908; Hagen et al., GCN 17909) is clearly detected in early observation in AAO. Preliminary photometry is following. telescope UT start t-T0 Filter Exp. OT Err. (mid, days) (s) AS-32 17:54:22 0.45669 None 44*120 21.20 0.1 AZT-8 19:43:21 0.49864 R 6*180 >19.4 (3sigma) Photometry is based on nearby USNO-B1.0 stars.