TITLE:   GCN CIRCULAR
NUMBER:  32787
SUBJECT: IPN triangulation of GRB 221017A (long)
DATE:    22/10/17 20:49:59 GMT
FROM:    Anna Ridnaia at Ioffe Institute  <ridnaia@mail.ioffe.ru>

A.S. Kozyrev, D.V. Golovin, M.L. Litvak, I.G. Mitrofanov, and A.B. Sanin
on behalf of the HEND/Mars-Odyssey team,

A. Ridnaia, D. Frederiks, D. Svinkin, A. Lysenko,
and T. Cline on behalf of the Konus-Wind team,

E. Bozzo and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team,

and

W. Boynton, C. Fellows, K. Harshman, H. Enos, R. Starr,
and A.S. Gardner on on behalf of the GRS-Odyssey GRB team,
report:

The long-duration GRB 221017A
(MAXI/GSC detection: Nawa et al., GCN 32777)
has been detected by MAXI (GSC), INTEGRAL (SPI-ACS), Konus-Wind,
and Mars-Odyssey (HEND), so far, at about 19789 s UT (05:29:49).

We have triangulated it to a preliminary, 3 sigma error box
whose coordinates are:
 ---------------------------------------------
  RA(2000), deg                 Dec(2000), deg
 ---------------------------------------------
 Center:
  116.901 (07h 47m 36s) +39.742 (+39d 44' 32")
 Corners:
  116.215 (07h 44m 52s) +41.438 (+41d 26' 15")
  117.708 (07h 50m 50s) +38.402 (+38d 24' 08")
  117.493 (07h 49m 58s) +37.908 (+37d 54' 28")
  116.024 (07h 44m 06s) +40.992 (+40d 59' 30")
 ---------------------------------------------
The error box area is 1.01 sq. deg, and its maximum
dimension is 3.7 deg (the minimum one is 19 arcmin).
The Sun distance was 91 deg.

This box may be improved.

The IPN localization is consistent with, but reduces the area of, the
MAXI/GSC localization (GCN 32777).

A triangulation map and HEALPix FITS file are posted at
http://www.ioffe.ru/LEA/GRBs/GRB221017_T19789/IPN

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