GCN Circular 29365
Subject
IPN triangulation of a bright burst from SGR 1935+2154
Date
2021-01-28T20:39:47Z (3 years ago)
From
Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru>
A. Ridnaia, S. Golenetskii, R. Aptekar, D. Frederiks, D. Svinkin,
and T. Cline on behalf of the Konus-Wind team,
K. Hurley, on behalf of the IPN,
and
S. Barthelmy, J. Cummings, H. Krimm, D. Palmer, and A. Tohuvavohu
on behalf of the Swift-BAT team, report:
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.