TITLE: GCN CIRCULAR NUMBER: 11199 SUBJECT: IPN Triangulation of the very bright GRB 100829A DATE: 10/09/03 20:42:29 GMT FROM: Valentin Pal'shin at Ioffe Inst S. Golenetskii, R. Aptekar, E. Mazets, V. Pal'shin, D. Frederiks, and T. Cline, on behalf of the Konus-Wind team, J. Goldsten, and K. Hurley, on behalf of the MESSENGER GRNS GRB team, V. Connaughton, M. Briggs, and C. Meegan, on behalf of the Fermi GBM team, J. Cummings, D. Palmer, S. Barthelmy, N. Gehrels, and H. Krimm, on behalf of the Swift-BAT team, and D. M. Smith, R. P. Lin, J. McTiernan, R. Schwartz, C. Wigger, and W. Hajdas, on behalf of the RHESSI GRB team, report: Fermi (GBM), Konus-Wind, Swift (BAT), MESSENGER (GRNS), and RHESSI observed the very bright GRB 100829A at about 75729 s UT (21:02:09) (the Fermi/GBM trigger 304808530). The burst was outside the coded field of view of the BAT. We have triangulated this burst to the following 3 sigma error box: ----------------------------------------------- RA(2000), deg Dec(2000), deg ----------------------------------------------- Center: 90.409 (06h 01m 38s) +30.314 (+30d 18' 49") Corners: 90.335 (06h 01m 20s) +29.523 (+29d 31' 22") 90.353 (06h 01m 25s) +30.317 (+30d 19' 02") 90.490 (06h 01m 58s) +31.121 (+31d 07' 16") 90.464 (06h 01m 51s) +30.310 (+30d 18' 37") ----------------------------------------------- The error box area is 278 sq. arcmin. The maximum distance between the box corners is 1.6 deg. This error box may be improved.