[vsnet-grb-info 24819] IPN triangulation of GRB 200125B

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  26918
SUBJECT: IPN triangulation of GRB 200125B
DATE:    20/01/28 16:20:12 GMT
FROM:    Dmitry Svinkin at Ioffe Institute  <svinkin at mail.ioffe.ru>

D. Svinkin, S. Golenetskii, R. Aptekar, D. Frederiks, A. Ridnaia,
and T. Cline on behalf of the Konus-Wind team,

K. Hurley, on behalf of the IPN,

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

S. Xiao, C. K. Li, X. B. Li, Y. Huang, and S. L. Xiong
on behalf of the Insight-HXMT/HE GRB team, report:

The long-duration, very bright GRB 200125B
(Fermi-GBM detection: The Fermi GBM team, GCN Circ. 26879;
BALROG localization: Biltzinger et al., GCN Circ. 26880;
Insight-HXMT/HE detection: Cai et al., GCN Circ. 26888)
was detected by Fermi (GBM trigger 601677816), Konus-Wind,
and Insight (HXMT/HE) at about 74611 s UT (20:43:31).

We have triangulated this GRB to a Konus-GBM annulus centered at
RA(2000)=321.900 deg (21h 27m 36s) Dec(2000)=-14.917 deg (-14d 55' 02")
whose radius is 86.537 +/- 0.136 deg (3 sigma) and a wider
Konus-HXMT annulus.

These annuli may be improved.

The annulus is consistent with, but reduces
the area of, the final Fermi-GBM (GCN Circ. 26879) and
BALROG (GCN Circ. 26880) localizations.

A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB200125_T74611/IPN/

The Konus-Wind time history and spectrum will be given in a forthcoming
GCN Circular.