TITLE:   GCN CIRCULAR
NUMBER:  17360
SUBJECT: IPN Triangulation of GRB 150127B
DATE:    15/01/29 22:08:46 GMT
FROM:    Dmitry Svinkin at Ioffe Institute  <svinkin@mail.ioffe.ru>

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

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

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, V. Pelassa,
and A. Goldstein, on behalf of the Fermi GBM 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:

A long-duration GRB 150127B has been observed by Fermi (GBM trigger 
444060509), Konus-Wind, Mars-Odyssey (HEND), MESSENGER (GRNS), and Swift 
(BAT), so far, at about 50906 s UT (14:08:26). 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:
    140.184 (09h 20m 44s)  -3.205 ( -3d 12' 18")
   Corners:
    140.849 (09h 23m 24s)  -3.717 ( -3d 43' 00")
    140.139 (09h 20m 33s)  -3.925 ( -3d 55' 29")
    139.534 (09h 18m 08s)  -2.676 ( -2d 40' 32")
    140.241 (09h 20m 58s)  -2.479 ( -2d 28' 43")
   ---------------------------------------------
The error box area is 1.0 sq. deg, and its maximum
dimension is 1.7 deg (the minimum one is 43 arcmin).
The Sun distance was 155 deg.

This box may be improved.

A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB150127_T50911/IPN/

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