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GCN Circular 26612

IPN triangulation of GRB 191227B (short)
2019-12-30T12:40:46Z (4 years ago)
Dmitry Svinkin at Ioffe Institute <>
K. Hurley, on behalf of the IPN,

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

D. Svinkin, S. Golenetskii, R. Aptekar, D. Frederiks, A. Ridnaia,
and T. Cline on behalf of the Konus-Wind team,

A. Goldstein, M. S. Briggs, and C. Wilson-Hodge
on behalf of the Fermi GBM team,

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

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

The very bright, short-duration GRB 191227B was detected by
Fermi (GBM trigger 599160109), Mars-Odyssey (HEND), Konus-Wind,
and Swift (BAT) at about 62504 s UT (17:21:44).
The burst was outside the coded field of view of the BAT.

We have triangulated it to two preliminary, 3 sigma error boxes
whose coordinates are:
Box 1:
   RA(2000), deg                 Dec(2000), deg
   256.466 (17h 05m 52s) -26.739 (-26d 44' 19")
   256.590 (17h 06m 22s) -26.856 (-26d 51' 20")
   256.273 (17h 05m 05s) -27.785 (-27d 47' 06")
   256.342 (17h 05m 22s) -26.619 (-26d 37' 09")
   256.724 (17h 06m 54s) -25.195 (-25d 11' 40")

  Box 2:
   RA(2000), deg                 Dec(2000), deg
   257.405 (17h 09m 37s) -19.765 (-19d 45' 52")
   257.550 (17h 10m 12s) -19.678 (-19d 40' 41")
   257.500 (17h 10m 00s) -18.708 (-18d 42' 29")
   257.260 (17h 09m 02s) -19.853 (-19d 51' 12")
   257.244 (17h 08m 59s) -21.319 (-21d 19' 08")
The area of each error box is 1162 sq. arcmin,
and their maximum dimension is 2.62 deg
(the minimum one is 14.16 arcmin).
The Sun distance for each box was ~18 deg.

These error boxes are both consistent with the GBM localization.

A triangulation map is posted at

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