TITLE:   GCN CIRCULAR
NUMBER:  15529
SUBJECT: IPN Triangulation of GRB 131127B
DATE:    13/11/28 13:02:01 GMT
FROM:    Valentin Pal'shin at Ioffe Inst  <val@mail.ioffe.ru>

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

K. Hurley on behalf of the IPN team, report:

The long-duration, intense GRB 131127B (von Kienlin, GCN 15528) has been 
observed by Fermi (GBM: trigger 407254341),  INTEGRAL (SPI-ACS), and 
Konus-Wind, so far, at about 51138 s UT (14:12:18).

We have triangulated it to a preliminary, 3 sigma error box whose 
coordinates are:
  ---------------------------------------------
   RA(2000), deg                 Dec(2000), deg
  ---------------------------------------------
  Center:
   304.839 (20h 19m 21s)  -2.830 ( -2d 49' 46")
  Corners:
   304.599 (20h 18m 24s)  -0.050 ( +0d 03' 01")
   305.856 (20h 23m 26s)  -5.612 ( -5d 36' 45")
   305.066 (20h 20m 16s)  -5.608 ( -5d 36' 28")
   303.808 (20h 15m 14s)  -0.033 ( +0d 02' 00")
  ---------------------------------------------
The error box area is 4.38 sq. deg, and its maximum
dimension is 5.9 deg (the minimum one is 0.77 deg).
The Sun distance was 62 deg.

This box can be improved.

All optical afterglow candidates reported by iPTF (Singer, GCN 15524) 
are far outside of the box.

A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB131127_T51139/IPN/