TITLE:   GCN CIRCULAR
NUMBER:  27210
SUBJECT: IPN triangulation of GRB 200221A (short)
DATE:    20/02/25 19:00:47 GMT
FROM:    Dmitry Svinkin at Ioffe Institute  <svinkin@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,

A. von Kienlin, X. Zhang, A. Rau, V. Savchenko, E. Bozzo,
and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team, and

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

The short-duration GRB 200221A (The Fermi GBM team, GCN Circ. 27159)
was detected by Fermi (GBM trigger 603949983), Konus-Wind,
INTEGRAL (SPI-ACS), and Insight (HXMT/HE)
at about 13979 s UT (03:52:59).

We have triangulated it to a preliminary, 3 sigma error box
whose coordinates are:
  --------------------------------
   RA(2000), deg   Dec(2000), deg
  --------------------------------
  Center:
    178.682        +33.400
  Corners:
    182.119        +35.008
    132.491        +48.390
    141.935        +43.606
    175.374        +31.702
    179.446         +3.183
    183.926         -3.580
  ---------------------------------
The error box area is 455 sq. deg, and its maximum
dimension is 68.5 deg (the minimum one is 6.5 deg).
The Sun distance was ~140 deg.

The IPN localization is consistent with, but reduces the area of, the 
Fermi-GBM one.

This box may be improved.

A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB200221_T13983/IPN

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