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GCN Circular 15506

IPN Triangulation of GRB 131118A
2013-11-20T18:42:44Z (11 years ago)
Valentin Pal'shin at Ioffe Inst <>
IPN Triangulation of GRB 131118A

K. Hurley, and J. Goldsten, on behalf of the MESSENGER NS GRB team,

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

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

W. Boynton, C. Fellows, K. Harshman, H. Enos, and R. Starr, on
behalf of the GRS-Odyssey GRB team,

V. Connaughton, M. S. 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,

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

The long-duration, intense GRB 131118A (Collazzi, GCN 15503) has been
observed by Fermi (GBM: trigger 406508340), INTEGRAL (SPI-ACS), Swift 
(BAT), Suzaku (WAM), MESSENGER (GRNS), Mars Odyssey (HEND), and 
Konus-Wind, so far, at about 82737 s UT (22:58:57). The burst was 
outside the coded field of view of the BAT.

We have triangulated it to a 3 sigma error box whose
coordinates are:
   RA(2000), deg                 Dec(2000), deg
   349.863 (23h 19m 27s) -66.833 (-66d 49' 58")
   350.415 (23h 21m 40s) -66.930 (-66d 55' 47")
   349.800 (23h 19m 12s) -66.926 (-66d 55' 32")
   349.313 (23h 17m 15s) -66.733 (-66d 44' 00")
   349.924 (23h 19m 42s) -66.740 (-66d 44' 23")
The error box area is 162 sq. arcmin, and its maximum
dimension is 29 arcmin (the minimum one is 12 arcmin). The Sun distance 
was 81.6 deg.

The center of the GBM ground position (Collazzi, GCN 15503) is 2.6 deg 
from the center of the box.

Some improvement in this triangulation is possible.
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