TITLE: GCN CIRCULAR NUMBER: 23247 SUBJECT: IPN Triangulation of GRB 180914A (long) DATE: 18/09/17 18:26:55 GMT FROM: Dmitry Svinkin at Ioffe Institute K. Hurley, on behalf of the IPN, I. G. Mitrofanov, D. Golovin, M. L. Litvak, and A. B. Sanin, on behalf of the HEND-Odyssey GRB team, D. Svinkin, S. Golenetskii, R. Aptekar, D. Frederiks, A. Kozlova, and T. Cline on behalf of the Konus-Wind team, A. Goldstein, M. S. Briggs, and C. Wilson-Hodge on behalf of the Fermi GBM 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 W. Boynton, C. Fellows, K. Harshman, H. Enos, and R. Starr, on behalf of the GRS-Odyssey GRB team, report: The long-duration GRB 180914A (Bissaldi et al., GCN Circ.23225; Poolakkil et al., GCN Circ. 23227) was detected by Fermi (GBM trigger 558621112), INTEGRAL (SPI-ACS), Konus-Wind, and Mars-Odyssey (HEND) at about 45107 s UT (12:31:47). We have triangulated it to a preliminary, 3 sigma error box whose coordinates are: --------------------------------------------- RA(2000), deg Dec(2000), deg --------------------------------------------- Center: 53.107 (03h 32m 26s) -5.687 ( -5d 41' 14") Corners: 52.535 (03h 30m 08s) -5.415 ( -5d 24' 53") 53.948 (03h 35m 48s) -8.072 ( -8d 04' 21") 53.677 (03h 34m 42s) -5.954 ( -5d 57' 13") 52.197 (03h 28m 47s) -3.090 ( -3d 05' 23") --------------------------------------------- The error box area is 2.36 sq. deg, and its maximum dimension is 5.28 deg (the minimum one is 45.48 arcmin). The Sun distance was 119 deg. This box may be improved. The distance between the XRT source (D'Elia et al., GCN circ. 23229) and the box center is 4.1 arcmin, supporting the association of the transient and the GRB. We thank Robert Wilson for noticing this. A triangulation map is posted at http://www.ioffe.ru/LEA/GRBs/GRB180914_T45107/IPN The Konus-Wind time history and spectrum will be given in a forthcoming GCN Circular.