GCN Circular 41447

Subject

IPN triangulation of GRB 250814C (short)

Event

GRB 250814C

Date

2025-08-20T14:48:51Z (a year ago)

From

Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>

Via

Web form

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

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

E. Burns on behalf of the IPN,

Y. Zhang, C. Wang, S. Xiong, J. Wei, and B. Cordier
on behalf of the SVOM-GRM team,

S. Barthelmy, J. Cummings, H. Krimm, D. Palmer, A. Tohuvavohu,
and J. DeLaunay on behalf of the Swift-BAT team,

and

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

The short-duration GRB 250814C
(SVOM-GRM detection: Wang et al., GCN 41385Loading...
 
 )
was detected by Konus-Wind, SVOM (GRM), Swift (BAT),
and Mars-Odyssey (HEND) at about 12263 s UT (03:24:23).
The burst was outside the coded field of view of the BAT.

We have triangulated it to a preliminary, 3 sigma error box
whose coordinates are:
 ---------------------------------------------
  RA(2000), deg                 Dec(2000), deg
 ---------------------------------------------
 Center:
  164.655 (10h 58m 37s) +47.526 (+47d 31' 35")
 Corners:
  164.814 (10h 59m 15s) +47.549 (+47d 32' 56")
  164.789 (10h 59m 09s) +47.597 (+47d 35' 48")
  164.497 (10h 57m 59s) +47.504 (+47d 30' 13")
  164.521 (10h 58m 05s) +47.456 (+47d 27' 21")
 ---------------------------------------------
The error box area is 39 sq. arcmin, and its maximum
dimension is 14 arcmin (the minimum one is 3 arcmin).
The Sun distance was 37 deg.

A triangulation map and HEALPix FITS file are posted at
http://www.ioffe.ru/LEA/GRBs/GRB250814_T12259/IPN/
The HEALPix triangulation map is the multi-order HEALPix in units of
probability density.

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