TITLE: GCN CIRCULAR NUMBER: 19939 SUBJECT: GRB160925A / Fermi 496473540: MASTER optical transient confirmation by LCOGT-FTN DATE: 16/09/26 10:26:53 GMT FROM: Cristiano Guidorzi at Ferrara U,Italy C. Guidorzi (U. Ferrara), S. Kobayashi, I.A. Steele (LJMU), C.G. Mundell (U. Bath), A. Gomboc (U. Nova Gorica) on behalf of a large collaboration report: The 2-m LCOGT Faulkes Telescope North began observing the MASTER optical transient possibly associated to GRB160925A/Fermi 496473540 (Lipunov et al., GCN 19938) on September 26, 08:11 UT (0.6 days since MASTER observations). We confirm the presence of an uncatalogued object at the following position: RA(J2000)= 22:28:17.82 Dec(J2000)= -14:56:56.6 with an uncertainty of 1.0 arcsec and R=16.17 +- 0.01 mag, I=16.00+-0.01 mag, as calibrated against USNOB-1 star 22:28:23.443, -14:57:33.95 using R2=13.69 mag, I=13.00 mag. Given its ecliptic coordinates (333 deg, -5 deg), with reference to the IAU Minor Planet Center we checked that there is no known minor planet or comet brighter than V=20.0 mag within 10 arcminutes at the epoch of our observations.