GCN Circular 35627

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

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

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 240123C
was detected by Konus-Wind, INTEGRAL (SPI-ACS),
Swift (BAT), and Mars-Odyssey (HEND)
at about 83553 s UT (23:12:33). 
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:
  244.077 (16h 16m 19s) -58.857 (-58d 51' 25")
 Corners:
  240.883 (16h 03m 32s) -55.715 (-55d 42' 55")
  241.066 (16h 04m 16s) -56.037 (-56d 02' 14")
  248.066 (16h 32m 16s) -61.657 (-61d 39' 24")
  247.747 (16h 30m 59s) -61.386 (-61d 23' 11")
 ---------------------------------------------
The error box area is 1219 sq. arcmin, and its maximum
dimension is 7.0 deg (the minimum one is 3 arcmin).
The Sun distance was 58 deg.

This localization may be improved.

A triangulation map and HEALPix FITS file are posted at
http://www.ioffe.ru/LEA/GRBs/GRB240123_T83553/IPN

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