TITLE: GCN CIRCULAR NUMBER: 18577 SUBJECT: IPN triangulation of GRB151107B DATE: 15/11/11 00:48:21 GMT FROM: Kevin Hurley at UCBerkeley/SSL K. Hurley, on behalf of the IPN, S. Golenetskii, R. Aptekar, V. Pal'shin, D. Frederiks, D. Svinkin, and T. Cline, on behalf of the Konus-Wind team, I. G. Mitrofanov, D. Golovin, M. L. Litvak, and A. B. Sanin, on behalf of the HEND-Odyssey GRB team, W. Boynton, C. Fellows, K. Harshman, H. Enos, and R. Starr, on behalf of the GRS-Odyssey GRB team, report: GRB 151107B (Stanbro and Meegan, GCN 18570) was also observed by Konus-Wind and Mars Odyssey-HEND. We have triangulated it to a preliminary annulus centered at RA, Dec(2000) = 357.447, -2.630, whose radius is 55.156 +/- 0.054 degrees (3 sigma). The minimum distance between the center line of this annulus and the MASTER-NET optical transient (Lipunov et al., GCN 18576) is 3.22 degrees, supporting the conclusion that the OT and the GRB are indeed unrelated. A map has been posted at ssl.berkeley.edu/ipn3/151107B.