[vsnet-grb-info 11682] IPN Triangulation of GRB 120316A

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  13073
SUBJECT: IPN Triangulation of GRB 120316A
DATE:    12/03/20 14:09:19 GMT
FROM:    Valentin Pal'shin at Ioffe Inst  <val at mail.ioffe.ru>

K. Hurley on behalf of the Mars Odyssey and MESSENGER GRB teams,

I. G. Mitrofanov, D. Golovin, M. L. Litvak, and A. B. Sanin,
on behalf of the HEND-Odyssey GRB team,

S. Golenetskii, R. Aptekar, E. Mazets, V. Pal'shin, D. Frederiks,
D. Svinkin, and T. Cline on behalf of the Konus-Wind 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,

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

K. Yamaoka, M. Ohno, Y. Hanabata, Y. Fukazawa, T. Takahashi, M. Tashiro,
Y. Terada, T. Murakami, and K. Makishima on behalf of the Suzaku WAM
team, report:

The long GRB 120316A was observed by Fermi (GBM: trigger 353549464), 
INTEGRAL (SPI-ACS), Konus-Wind, Mars Odyssey (HEND), Suzaku (WAM), and 
Swift (BAT) (outside the coded field of view) at about 662 s UT (00:11:02).

We have triangulated it to a preliminary, 3 sigma error box whose 
coordinates are:
  ---------------------------------------------
   RA(2000), deg                 Dec(2000), deg
  ---------------------------------------------
  Center:
    57.016 (03h 48m 04s) -56.288 (-56d 17' 15")
  Corners:
    56.269 (03h 45m 05s) -57.541 (-57d 32' 28")
    57.363 (03h 49m 27s) -57.038 (-57d 02' 16")
    57.698 (03h 50m 48s) -55.028 (-55d 01' 42")
    56.676 (03h 46m 42s) -55.538 (-55d 32' 18")
  ---------------------------------------------

The error box area is 1.07 sq. deg, and its maximum
dimension is 2.6 deg.

This box can be improved.

The LAT position reported by Zheng & Akerlof (GCN
13070 ) is consistent with the IPN box (the center of this position is 
outside the box, but the error circle overlaps with the box).

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

A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB120316_T00672/IPN/