TITLE:   GCN CIRCULAR
NUMBER:  21428
SUBJECT: IPN Triangulation of GRB 170805B (short/hard)
DATE:    17/08/08 17:27:03 GMT
FROM:    Dmitry Svinkin at Ioffe Institute  <svinkin@mail.ioffe.ru>

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, and

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

A short-duration GRB 170805B was detected by Konus-Wind,
INTEGRAL (SPI-ACS), and Mars-Odyssey (HEND)
at about 51525 s UT (14:18:45).

We have triangulated it to a preliminary, 3 sigma error box whose 
coordinates are:
  ---------------------------------------------
   RA(2000), deg                 Dec(2000), deg
  ---------------------------------------------
  Center:
   137.274 (09h 09m 06s) +69.613 (+69d 36' 46")
  Corners:
   135.477 (09h 01m 54s) +69.580 (+69d 34' 49")
   136.562 (09h 06m 15s) +69.715 (+69d 42' 55")
   139.059 (09h 16m 14s) +69.622 (+69d 37' 18")
   137.975 (09h 11m 54s) +69.506 (+69d 30' 23")
  ---------------------------------------------
The error box area is 506 sq. arcmin, and its maximum
dimension is 1.25 deg (the minimum one is 9.6 arcmin).
The Sun distance was 52 deg.

This box may be improved.

Note that the positions of GRB 170805A and 170805B are inconsistent
with one another, ruling out a repeating source origin such as
a single magnetar.

A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB170805_T51527/IPN

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