[vsnet-grb-info 19110] IPN Triangulation of GRB 170209A

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  20656
SUBJECT: IPN Triangulation of GRB 170209A
DATE:    17/02/09 23:58:53 GMT
FROM:    Anna Kozlova at Ioffe Institute  <ann_kozlova at 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,

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

V. Connaughton, M. S. Briggs, C. Meegan, V. Pelassa,
and A. Goldstein, on behalf of the Fermi GBM 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:

The long-duration GRB 170209A
(Fermi GBM Detection: Roberts & Meegan, GCN Circ. 20652)
has been  detected by Fermi (GBM), Konus-Wind, INTEGRAL (SPI-ACS),
and Mars-Odyssey (HEND), so far, at about 4118 s UT (01:08:38).

We have triangulated it to a preliminary, 3 sigma error box whose
coordinates are:
---------------------------------------------
  RA(2000), deg                 Dec(2000), deg
 ---------------------------------------------
 Center:
  110.686 (07h 22m 45s) -51.959 (-51d 57' 34")
 Corners:
  111.873 (07h 27m 29s) -55.694 (-55d 41' 38")
  111.366 (07h 25m 28s) -55.308 (-55d 18' 29")
  109.742 (07h 18m 58s) -48.166 (-48d 09' 58")
  110.149 (07h 20m 36s) -48.575 (-48d 34' 30")
 ---------------------------------------------
The error box area is 1.66 sq. deg, and its maximum
dimension is 7.64 deg (the minimum one is 13.1 arcmin).
The Sun distance was 105 deg.

This box may be improved.

The distance between the narrowest annulus (GBM-HEND annulus with
3 sigma half width of 0.109 deg) center line and the optical transient
J072307.30-521446.6 (Podesta et al., GCN Circ. 20650) is 1 arcmin,
supporting the association of the transient and the GRB.

A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB170209_T04120/IPN/

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