TITLE:   GCN CIRCULAR
NUMBER:  18773
SUBJECT: IPN Triangulation of GRB 151227B
DATE:    15/12/30 14:00:22 GMT
FROM:    Dmitry Svinkin at Ioffe Institute  <svinkin@mail.ioffe.ru>

K. Hurley, on behalf of the IPN,

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

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

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,

S. Barthelmy, J. Cummings, N. Gehrels, 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 long-duration GRB 151227B has been detected by Fermi (GBM: Toelge 
and Bissaldi, GCN Circ. 18727), Konus-Wind, Mars-Odyssey (HEND), 
INTEGRAL (SPI-ACS), and Swift (BAT), so far, at about 18829 s UT 
(05:13:49). 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:
   290.284 (19h 21m 08s) +35.415 (+35d 24' 55")
  Corners:
   290.279 (19h 21m 07s) +35.990 (+35d 59' 22")
   290.052 (19h 20m 13s) +36.037 (+36d 02' 12")
   290.288 (19h 21m 09s) +34.841 (+34d 50' 26")
   290.512 (19h 22m 03s) +34.792 (+34d 47' 32")
  ---------------------------------------------
The error box area is 759 sq. arcmin, and its maximum
dimension is 1.3 deg (the minimum one is 10.4 arcmin).
The Sun distance was 60 deg.

This box may be improved.

A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB151227_T18827/IPN/

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