IPN triangulation of a bright burst from SGR 1935+2154

The bright, short-duration, soft burst (GECAM detection: Huang et al., GCN Circ. 29363) was detected by GECAM, Konus-Wind, and Swift (BAT) at about 24617 s UT (06:50:17) on January 27. 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)=315.213 deg (21h 00m 51s) Dec(2000)=-14.116 deg (-14d 06' 56"), whose radius is 41.658 +/- 0.174 deg (3 sigma). The position of SGR 1935+2154 lies inside the annulus at 3.5 arcmin from its center line. Given the positional coincidence (initially suggested in GCN 29363) 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/210127_T24616/IPN/ The Konus-Wind time history and spectrum will be given in a forthcoming GCN Circular.