TITLE: GCN CIRCULAR NUMBER: 15600 SUBJECT: IPN Triangulation of GRB 131216A DATE: 13/12/18 18:06:25 GMT FROM: Dmitry Svinkin at Ioffe Institute K. Hurley and J. Goldsten, on behalf of the MESSENGER NS GRB team, S. Golenetskii, R. Aptekar, V. Pal'shin, D. Frederiks, D. Svinkin, and T. Cline on behalf of the Konus-Wind team, A. von Kienlin, X. Zhang, A. Rau, V. Savchenko, E. Bozzo, and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team, K. Yamaoka, M. Ohno, Y. Hanabata, Y. Fukazawa, T. Takahashi, M. Tashiro, Y. Terada, T. Murakami, and K. Makishima, on behalf of the Suzaku WAM team, S. Barthelmy, J. Cummings, N. Gehrels, H. Krimm, and D. Palmer, on behalf of the Swift-BAT team, and V. Connaughton, M. S. Briggs, C. Meegan, V. Pelassa, and A. Goldstein, on behalf of the Fermi GBM team, report: The long-duration GRB 131216A (V. Pelassa GCN Circ. 15599; P. Veres et al. GCN Circ. 15598) was observed by Fermi (GBM: trigger 408851795), Konus-Wind, INTEGRAL (SPI-ACS), Swift (BAT), Suzaku (WAM), and MESSENGER (GRNS) at about 6992 s UT (01:56:32). The burst was outside the coded field of view of the BAT. We have triangulated it to a preliminary, 3 sigma error box whose coordinates are: --------------------------------------------- RA(2000), deg Dec(2000), deg --------------------------------------------- Center: 94.674 (06h 18m 42s) -41.627 (-41d 37' 35") Corners: 88.596 (05h 54m 23s) -43.014 (-43d 00' 51") 99.822 (06h 39m 17s) -40.204 (-40d 12' 16") 100.505 (06h 42m 01s) -39.743 (-39d 44' 34") 89.379 (05h 57m 31s) -42.669 (-42d 40' 08") --------------------------------------------- The error box area is 1.8 sq. deg, and its maximum dimension is 9.5 deg (the minimum one is 0.2 deg). The center of the GBM ground position (V. Pelassa GCN Circ. 15599) is 6.58 deg from the center of the box. This box may be improved. A triangulation map is posted at http://www.ioffe.ru/LEA/GRBs/GRB131216_T06993/IPN/