TITLE:   GCN CIRCULAR
NUMBER:  29355
SUBJECT: IPN triangulation of GRB 210124B (short)
DATE:    21/01/26 13:08:39 GMT
FROM:    Dmitry Svinkin at Ioffe Institute  <svinkin@mail.ioffe.ru>

K. Hurley, on behalf of the IPN,

I. G. Mitrofanov, D. V. Golovin, A. S. Kozyrev, M. L. Litvak,
and A. B. Sanin, on behalf of the HEND-Odyssey GRB team,

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

W. Boynton, C. Fellows, K. Harshman, H. Enos, and R. Starr,
on behalf of the GRS-Odyssey GRB team, report:

The short-duration, bright GRB 210124B
(Insight-HXMT/HE detection: Liu et al., GCN Circ. 29353)
has been detected by Konus-Wind, Mars-Odyssey (HEND),
INTEGRAL (SPI-ACS), and Insight (HXMT/HE), so far,
at about 48220 s UT (13:23:40).

We have triangulated it to a preliminary, 3 sigma error box
whose coordinates are:
  ---------------------------------------------
   RA(2000), deg                 Dec(2000), deg
  ---------------------------------------------
  Center:
   274.333 (18h 17m 20s)  -0.443 ( +0d 26' 36")
  Corners:
   274.258 (18h 17m 02s)  -0.358 ( +0d 21' 29")
   274.313 (18h 17m 15s)  -0.234 ( +0d 14' 01")
   274.409 (18h 17m 38s)  -0.529 ( +0d 31' 43")
   274.354 (18h 17m 25s)  -0.654 ( +0d 39' 15")
  ---------------------------------------------
The error box area is 101 sq. arcmin, and its maximum
dimension is 25 arcmin (the minimum one is 5.4 arcmin).
The Sun distance was 37 deg.

The box has rather low galactic latitude of 7.4 deg, but significant 
emission above ~300 keV provides strong evidence against SGR origin of 
this burst.

This box may be improved.

A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB210124_T48224/IPN

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