TITLE: GCN CIRCULAR NUMBER: 16988 SUBJECT: IPN triangulation of GRB 141029B DATE: 14/10/29 23:05:18 GMT FROM: Kevin Hurley at UCBerkeley/SSL K. Hurley, on behalf of the IPN, J. Goldsten, on behalf of the MESSENGER NS GRB team, A. von Kienlin, X. Zhang, A. Rau, V. Savchenko, E. Bozzo, and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team, and V. Connaughton, M. S. Briggs, C. Meegan, and V. Pelassa, on behalf of the Fermi GBM team, report: GRB 141029B (Roberts et al. GCN 16987) was also observed by INTEGRAL (SPI-ACS) and MESSENGER, so far. We have triangulated it to a preliminary, 3 sigma annulus, whose coordinates are RA (center), Dec (center), radius= 16.850, +5.225, 87.104 +/- 0.259 degrees. This annulus intersects the GBM 1 sigma (statistical-only) error circle at two points: RA(deg) Dec(deg) 105.735 +24.226 105.874 +25.894 to form an error box whose area is approximately 0.56 sq. deg. This triangulation may be improved. A map has been posted at ssl.berkeley.edu/ipn3/141029B