[vsnet-grb-info 15935] IPN Triangulation of GRB 141222A (very intense)

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  17223
SUBJECT: IPN Triangulation of GRB 141222A (very intense)
DATE:    14/12/23 14:53:35 GMT
FROM:    Dmitry Svinkin at Ioffe Institute  <svinkin at 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 and J. Goldsten, on behalf of the MESSENGER NS GRB team,

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

The hard-spectrum, very intense GRB 141222A has been observed by
Fermi (GBM: Jenke, GCN Circ. 17220; LAT: McEnery et al., GCN Circ. 
17218), Konus-Wind, INTEGRAL (SPI-ACS), and MESSENGER (GRNS), so far, at 
about 25737 s UT (07:08:57).

We have triangulated it to a preliminary, 3 sigma error box whose 
coordinates are:
  ---------------------------------------------
   RA(2000), deg                 Dec(2000), deg
  ---------------------------------------------
  Center:
   178.156 (11h 52m 38s) -57.280 (-57d 16' 47")
  Corners:
   178.029 (11h 52m 07s) -57.604 (-57d 36' 15")
   178.063 (11h 52m 15s) -57.239 (-57d 14' 20")
   178.284 (11h 53m 08s) -56.954 (-56d 57' 15")
   178.250 (11h 53m 00s) -57.321 (-57d 19' 15")
  ---------------------------------------------
The error box area is 138 sq. arcmin, and its maximum
dimension is 40 arcmin (the minimum one is 6 arcmin).

This box may be improved.

The box overlaps with about a half of the Fermi-LAT error circle, 
reported in GCN Circular 17218, with the center of the circle lying 
slightly outside the box.

A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB141222_T25735/IPN/

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