GCN Circular 38880

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,

E. Bozzo and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team,

S. Barthelmy, J. Cummings, H. Krimm, D. Palmer, and A. Tohuvavohu
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 250107D
was detected by Konus-Wind, INTEGRAL (SPI-ACS),
Swift (BAT), and Mars-Odyssey(HEND), at about 19406 s UT (05:23:26).
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:
  259.300 (17h 17m 12s) -29.710 (-29d 42' 37")
 Corners:
  259.267 (17h 17m 04s) -28.346 (-28d 20' 46")
  259.147 (17h 16m 35s) -30.541 (-30d 32' 29")
  259.382 (17h 17m 32s) -30.988 (-30d 59' 15")
  259.469 (17h 17m 52s) -28.855 (-28d 51' 18")
 ---------------------------------------------
The error box area is 1635 sq. arcmin, and its maximum
dimension is 2.6 deg (the minimum one is 12.6 arcmin).
The Sun distance was 27 deg.

This localization may be improved.

A triangulation map and HEALPix FITS file are posted at
http://www.ioffe.ru/LEA/GRBs/GRB250107_T19411/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.