GCN Circular 21257

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,

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

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

and

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

A short-duration, hard-spectrum GRB 170616A was detected by
Konus-Wind, Mars-Odyssey (HEND), and INTEGRAL (SPI-ACS),
at about 57987 s UT (16:06:27).

We have triangulated it to a preliminary, 3 sigma error box whose 
coordinates are:
---------------------------------------------
   RA(2000), deg                 Dec(2000), deg
  ---------------------------------------------
  Center:
   113.437 (07h 33m 45s)  -2.244 ( -2d 14' 37")
  Corners:
   114.982 (07h 39m 56s)  -1.242 ( -1d 14' 32")
   114.689 (07h 38m 45s)  -1.669 ( -1d 40' 08")
   111.834 (07h 27m 20s)  -3.158 ( -3d 09' 28")
   112.167 (07h 28m 40s)  -2.763 ( -2d 45' 46")
  ---------------------------------------------
The error box area is 2500 sq. arcmin, and its maximum
dimension is 3.68 deg (the minimum one is 13 arcmin).
The Sun distance was 37 deg.

This box may be improved.

A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB170616_T57991/IPN

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