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GCN Circular 22290

Subject
IPN Triangulation of GRB 171227A
Date
2017-12-28T15:01:10Z (6 years ago)
From
Anna Kozlova at Ioffe Institute <ann_kozlova@mail.ioffe.ru>
A. Kozlova, S. Golenetskii, R. Aptekar, D. Frederiks, D. Svinkin,
and T. Cline on behalf of the Konus-Wind team,

K. Hurley, on behalf of the IPN,

V. Connaughton, M. S. Briggs, C. Meegan, V. Pelassa,
and A. Goldstein, 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

G. Di Cocco, F. Fuschino, M. Galli, C. Labanti, M. Marisaldi,
and A. Ursi on behalf of the AGILE MCAL team, report:

The long-duration GRB 171227A
(AGILE-MCAL detection: Verrecchia et al.,
GCN Circ. 22288, Fermi-GBM observation: Hui et al., GCN Circ. 22289)
was detected by Konus-Wind, Fermi (GBM trigger 536025618), INTEGRAL 
(SPI-ACS),
and AGILE (MCAL) at about 13 s UT (00:00:13).

We have triangulated it to a preliminary, 3-sigma error box whose 
coordinates are:
---------------------------------------------
   RA(2000), deg                 Dec(2000), deg
  ---------------------------------------------
  Center:
   290.998 (19h 24m 00s) -47.012 (-47d 00' 43")
  Corners:
   295.738 (19h 42m 57s) -48.264 (-48d 15' 50")
   284.827 (18h 59m 19s) -46.296 (-46d 17' 44")
   287.178 (19h 08m 43s) -45.288 (-45d 17' 16")
   298.814 (19h 55m 15s) -46.606 (-46d 36' 22")
  ---------------------------------------------
The error box area is 12.8 sq. deg, and its maximum
dimension is 9.6 deg (the minimum one is 96.7 arcmin).
The Sun distance was 24 deg.

This box may be improved.

A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB171227_T00009/IPN

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