TITLE:   GCN CIRCULAR
NUMBER:  14561
SUBJECT: IPN Triangulation of GRB 130504B
DATE:    13/05/04 22:39:03 GMT
FROM:    Valentin Pal'shin at Ioffe Inst  <val@mail.ioffe.ru>

S. Golenetskii, R. Aptekar, E. Mazets, 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. Briggs, and C. Meegan, 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

S. Barthelmy, J. Cummings, N. Gehrels, H. Krimm, and D. Palmer, on
behalf of the Swift-BAT team, report:

The short-duration, hard spectrum, intense GRB 130504B (von Kienlin et 
al., GCN Circ. 14560) has been observed by Fermi GBM, INTEGRAL 
(SPI-ACS), Konus-Wind, Swift (BAT), and MESSENGER (GRNS), so far, at 
about 27123 s UT (07:32:03). The burst was outside the coded field of 
view of the BAT.

We have triangulated it to a preliminary, 3 sigma error box whose 
coordinates are:
  ---------------------------------------------
   RA(2000), deg                 Dec(2000), deg
  ---------------------------------------------
  Center:
   347.952 (23h 11m 49s)  -5.739 ( -5d 44' 20")
  Corners:
   347.658 (23h 10m 38s)  -5.056 ( -5d 03' 20")
   348.087 (23h 12m 21s)  -6.133 ( -6d 07' 58")
   348.256 (23h 13m 01s)  -6.420 ( -6d 25' 10")
   347.821 (23h 11m 17s)  -5.345 ( -5d 20' 41")
  ---------------------------------------------
The error box area is 196 sq. arcmin, and its maximum
dimension is 1.5 deg (the minimum one is 2.9 arcmin). The Sun distance 
was 57 deg.

This box can be improved.

The center of the GBM location (von Kienlin, GCN Circ. 14560) is 5.6
deg from the center of the IPN box.

A triangulation map will be posted at
http://www.ioffe.ru/LEA/GRBs/GRB130504_T27119/IPN/