TITLE: GCN CIRCULAR NUMBER: 30598 SUBJECT: IPN Triangulation of a bright burst from SGR 1935+2154 DATE: 21/08/07 02:29:56 GMT FROM: Dmitry Svinkin at Ioffe Institute D. Svinkin, S. Golenetskii, D. Frederiks, A. Ridnaia, A. Lysenko, and T. Cline on behalf of the Konus-Wind team, K. Hurley, on behalf of the IPN, S. Barthelmy, J. Cummings, H. Krimm, D. Palmer, and A. Tohuvavohu on behalf of the Swift-BAT team, and A. von Kienlin, X. Zhang, A. Rau, V. Savchenko, E. Bozzo, and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team, report: A bright, short-duration, soft burst has been observed by Konus-Wind, INTEGRAL (SPI-ACS), and Swift (BAT), so far, at about 536 s UT (00:08:56) on August 5. The burst was outside the coded field of view of the BAT. We have triangulated it to a Konus-BAT annulus centered at RA(2000)=313.877 deg (20h 55m 31s) Dec(2000)=-20.391 deg (-20d 23' 28"), whose radius is 46.762 +/- 0.249 deg (3 sigma) and to a Konus-SPI-ACS annulus centered at RA(2000)=310.504 deg (20h 42m 01s) Dec(2000)=-16.410 deg (-16d 24' 34"), whose radius is 41.919 +/- 0.512 deg (3 sigma). This localization may be improved. The position of SGR 1935+2154 is inside the annuli at 7.2 arcmin from the center line of the Konus-BAT annulus. Given the positional coincidence of this burst with SGR 1935+2154, its time history, 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/210805_T00539/IPN/ The time history and spectrum will be given in forthcoming GCN Circulars.