TITLE:   GCN CIRCULAR
NUMBER:  17324
SUBJECT: IPN triangulation of GRB 150118C (short/hard)
DATE:    15/01/20 19:57:10 GMT
FROM:    Valentin Pal'shin at Ioffe Inst  <val@mail.ioffe.ru>

S. Golenetskii, R. Aptekar, V. Pal'shin, 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,

V. Connaughton, M. S. Briggs, C. Meegan, V. Pelassa,
and A. Goldstein, on behalf of the Fermi GBM 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 150118C has been observed by Fermi 
(GBM trigger  443312075), Konus-Wind, and Mars Odyssey (HEND), so far, 
at about 80073 s UT (22:14:33).

We have triangulated it to a preliminary, 3 sigma error box whose
coordinates are:
  ---------------------------------------------
   RA(2000), deg                 Dec(2000), deg
  ---------------------------------------------
  Center:
   160.077 (10h 40m 18s) -27.555 (-27d 33' 19")
  Corners:
   160.615 (10h 42m 28s) -27.410 (-27d 24' 37")
   160.100 (10h 40m 24s) -27.656 (-27d 39' 22")
   159.542 (10h 38m 10s) -27.693 (-27d 41' 34")
   160.054 (10h 40m 13s) -27.455 (-27d 27' 16")
  ---------------------------------------------
The error box area is 366 sq. arcmin, and its maximum
dimension is 1.0 deg (the minimum one is 12 arcmin). The Sun distance 
was 119 deg.

The center of the GBM ground position is 4.0 deg from the center of the box.

This box may be improved.

A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB150118_T80075/IPN/

The time history and spectrum will be given in forthcoming GCN Circulars.