TITLE: GCN CIRCULAR NUMBER: 12452 SUBJECT: IPN Triangulation of GRB 111016B (long duration, intense) DATE: 11/10/18 23:01:32 GMT FROM: Valentin Pal'shin at Ioffe Inst K. Hurley, on behalf of the Mars Odyssey and MESSENGER GRB teams, J. Goldsten, on behalf of the MESSENGER NS GRB team, I. G. Mitrofanov, D. Golovin, M. L. Litvak, and A. B. Sanin, on behalf of the HEND-Odyssey GRB team, S. Golenetskii, R. Aptekar, E. Mazets, V. Pal'shin, D. Frederiks, D. Svinkin, and T. Cline on behalf of the Konus-Wind team, S. Barthelmy, J. Cummings, N. Gehrels, H. Krimm, and D. Palmer, on behalf of the Swift-BAT team, D. M. Smith, R. P. Lin, J. McTiernan, R. Schwartz, and W. Hajdas, on behalf of the RHESSI GRB team, W. Boynton, C. Fellows, K. Harshman, H. Enos, and R. Starr, on behalf of the GRS-Odyssey GRB team, report: The long-duration, intense GRB 111016B was observed by Konus-Wind, Mars Odyssey (HEND), MESSENGER (GRNS), RHESSI, and Swift (BAT) (outside the coded field of view) at 81700 s UT (22:41:40). We have triangulated it to a preliminary, 3 sigma error box whose coordinates are: --------------------------------------------- RA(2000), deg Dec(2000), deg --------------------------------------------- Center: 290.499 (19h 22m 00s) -4.578 ( -4d 34' 39") Corners: 290.322 (19h 21m 17s) -4.416 ( -4d 24' 56") 290.513 (19h 22m 03s) -4.048 ( -4d 02' 53") 290.676 (19h 22m 42s) -4.740 ( -4d 44' 24") 290.487 (19h 21m 57s) -5.119 ( -5d 07' 09") --------------------------------------------- The error box area is 696 sq. arcmin, and its maximum dimension is 64 arcmin. This box can be improved. The time history and spectrum will be given in a forthcoming GCN Circular.