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GCN Circular 14001

Subject
IPN Triangulation of GRB 121122A (long/intense)
Date
2012-11-26T20:19:40Z (11 years ago)
From
Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>
K. Hurley and J. Goldsten, on behalf of the MESSENGER GRNS 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, C. Meegan, and V. Pelassa, 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,

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,

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

A long-duration, intense GRB 121122A with strong spectral evolution was 
observed by Konus-Wind, Fermi (GBM: trigger 375311695), INTEGRAL 
(SPI-ACS), MESSENGER (GRNS), Swift (BAT), and Suzaku (WAM), at about 
76493 s UT (21:14:53). 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:
     35.262 (02h 21m 03s) +45.139 (+45d 08' 21")
   Corners:
     50.638 (03h 22m 33s) +46.661 (+46d 39' 39")
     46.318 (03h 05m 16s) +47.134 (+47d 08' 01")
     25.058 (01h 40m 14s) +40.194 (+40d 11' 39")
     27.431 (01h 49m 44s) +41.325 (+41d 19' 31")
   ---------------------------------------------
The error box area is 6.9 sq. deg, and its maximum dimension is 19.6 deg 
(the minimum one is 2.1 deg, the minimum annulus width is 0.2 deg).

This box can be improved.

A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB121122_T76497/IPN/

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