TITLE: GCN CIRCULAR NUMBER: 39022 SUBJECT: IPN triangulation of a bright burst from SGR 1E1841-045 DATE: 25/01/24 16:18:56 GMT FROM: Dmitry Svinkin at Ioffe Institute svinkin@mail.ioffe.ru

D. Svinkin, A. Ridnaia, D. Frederiks, A. Lysenko, and T. Cline on behalf of the Konus-Wind team,

A. Goldstein, M. S. Briggs, C. Wilson-Hodge, and E. Burns on behalf of the Fermi GBM team,

Y. Zhang, C. Wang, S. Xiong, J. Wei, and B. Cordier on behalf of the SVOM-GRM team, report:

A very bright, short-duration, soft burst was detected by Konus-Wind, Fermi (GBM trigger 759314844), and SVOM (GRM) at about 31640 s UT (08:47:20) on January 23.

We have triangulated it to the following annuli: --------------------------------------------------- annulus R.A. Dec. R dR (3sigma) (deg) (deg) (deg) (deg) --------------------------------------------------- Konus-GBM 285.928 -20.729 16.594 0.148 Konus-GRM 285.926 -20.738 16.277 0.567 ---------------------------------------------------

Among known SGRs, only the position of SGR 1E1841-045 is inside the annuli. Given the positional coincidence of this burst with SGR 1E1841-045, its time history, and softness of its spectrum (as observed by Konus-Wind), we conclude this burst is likely originated from SGR 1E1841-045.

A triangulation map is posted at http://www.ioffe.ru/LEA/SGRs/250123_T31634/IPN/

The time history and spectrum will be given in forthcoming GCN circulars.

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