TITLE: GCN CIRCULAR NUMBER: 17699 SUBJECT: IPN Triangulation of a bright burst from SGR 1935+2154 DATE: 15/04/14 13:03:18 GMT FROM: Dmitry Svinkin at Ioffe Institute S. Golenetskii, R. Aptekar, V. Pal'shin, D. Frederiks, D. Svinkin, and T. Cline on behalf of the Konus-Wind team, 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, 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: A bright, short-duration, soft burst has been observed by Konus-Wind, INTEGRAL (SPI-ACS), and Mars-Odyssey (HEND), so far, at about 41064 s UT (11:24:24) on April 12. We have triangulated it to a preliminary, 3 sigma error box whose coordinates are: --------------------------------------------- RA(2000), deg Dec(2000), deg --------------------------------------------- Center: 293.489 (19h 33m 57s) +22.543 (+22d 32' 35") Corners: 293.060 (19h 32m 14s) +23.547 (+23d 32' 50") 293.029 (19h 32m 07s) +24.004 (+24d 00' 14") 293.918 (19h 35m 40s) +21.515 (+21d 30' 54") 293.951 (19h 35m 48s) +21.033 (+21d 02' 00") --------------------------------------------- The error box area is 1118 sq. arcmin, and its maximum dimension is 3 deg (the minimum one is 7 arcmin). The Sun distance was 84 deg. This box may be improved. The position of SGR 1935+2154 (Stamatikos et., al. GCN Circ. 16520; Lien et al., GCN Circ. 16522; Cummmings et al., ATel #6294) is inside the box at 41 arcmin from its center (at 0.8 arcmin from the center line of the 7 arcmin wide Konus-HEND annulus). Given the positional coincidence of this burst with SGR 1935+2154 and softness of its spectrum (as observed by Konus-Wind), we conclude this burst is likely originated from SGR 1935+2154. A triangulation map is posted at http://www.ioffe.ru/LEA/SGRs/150412_T41064/IPN/ The Konus-Wind time history and spectrum will be given in a forthcoming GCN Circular.