TITLE:   GCN CIRCULAR
NUMBER:  21164
SUBJECT: IPN Triangulation of GRB 170527A
DATE:    17/05/30 15:11:47 GMT
FROM:    Anna Kozlova at Ioffe Institute  <ann_kozlova@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,

A. Kozlova, 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, 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 170527A (Stanbro et al.,GCN 21157)
was detected by Fermi(GBM), Konus-Wind, and
Mars-Odyssey(HEND), at about 41467 s UT (11:31:07).

We have triangulated it to a preliminary, 3 sigma error box whose
coordinates are:
 ---------------------------------------------
  RA(2000), deg       Dec(2000), deg
 ---------------------------------------------
 Center:
   192.3245             -1.4883
 Corners:
   192.3882             -1.5179
   197.2538             +8.1347
   196.7137             +7.4412
   192.2608             -1.4588
   188.2675            -10.5805
   188.0687            -11.4344
 ---------------------------------------------
The error box area is 2.9 sq. deg, and its maximum
dimension is 21.6 deg (the minimum one is 8.4 arcmin).
The Sun distance was about 125 deg.

This box may be improved.

A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB170527_T41466/IPN/

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