TITLE:   GCN CIRCULAR
NUMBER:  18836
SUBJECT: IPN Triangulation of GRB 151225A (short/hard)
DATE:    16/01/06 18:36:49 GMT
FROM:    Dmitry Svinkin at Ioffe Institute  <svinkin@mail.ioffe.ru>

S. Golenetskii, R. Aptekar, D. Frederiks, D. Svinkin,
and T. Cline on behalf of the Konus-Wind team,

K. Hurley, on behalf of the IPN,

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

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

S. Barthelmy, J. Cummings, N. Gehrels, H. Krimm, and D. Palmer,
on behalf of the Swift-BAT 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, hard-spectrum GRB 151225A (Kawakubo et al., GCN 
Circ. 18724) has been detected by CALET (CGBM), Konus-Wind, Swift (BAT), 
INTEGRAL (SPI-ACS), and Mars-Odyssey (HEND), so far, at about 68950 s UT 
(19:09:10). 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:
   227.901 (15h 11m 36s) -18.302 (-18d 18' 07")
  Corners:
   228.654 (15h 14m 37s) -16.789 (-16d 47' 21")
   228.463 (15h 13m 51s) -16.574 (-16d 34' 25")
   227.176 (15h 08m 42s) -19.869 (-19d 52' 07")
   227.374 (15h 09m 30s) -20.101 (-20d 06' 03")
  ---------------------------------------------
The error box area is 3179 sq. arcmin, and its maximum
dimension is 3.7 deg (the minimum one is 15 arcmin).
The Sun distance was 43 deg.

This box may be improved.

A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB151225_T68946/IPN/

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