TITLE:   GCN CIRCULAR
NUMBER:  32842
SUBJECT: IPN triangulation of GRB 221022B (long)
DATE:    22/10/25 11:38:41 GMT
FROM:    Anna Ridnaia at Ioffe Institute  <ridnaia@mail.ioffe.ru>

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

A. Goldstein, M. S. Briggs, and C. Wilson-Hodge
on behalf of the Fermi GBM team,

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

and

S. Barthelmy, J. Cummings, H. Krimm, D. Palmer, and A. Tohuvavohu
on behalf of the Swift-BAT team, report:

The long-duration GRB 221022B
(Fermi/GBM detection: Fermi GBM team, GCN 32820;
Poolakkil & Meegan, GCN 32830;
AGILE detection: Casentini et al., GCN 32822;
Swift/BAT-GUANO detection: Raman et al., GCN 32823;
AstroSat CZTI detection: Gopalakrishnan et al., GCN 32837)
has been detected by Fermi (GBM), INTEGRAL (SPI-ACS),
Konus-Wind, AGILE (MCAL, AC), AstroSat (CZTI) and
Swift (BAT), so far, at about 82549 s UT (22:55:49).
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:
  170.477 (11h 21m 55s) +18.413 (+18d 24' 46")
 Corners:
  179.823 (11h 59m 18s) +26.613 (+26d 36' 46")
  161.965 (10h 47m 52s) +10.411 (+10d 24' 38")
  164.336 (10h 57m 21s)  +9.908 ( +9d 54' 28")
  183.830 (12h 15m 19s) +26.171 (+26d 10' 14")
 ---------------------------------------------
The error box area is 52.5 sq. deg, and its maximum
dimension is 26.0 deg (the minimum one is 2.2 deg).
The Sun distance was 43 deg.

This box may be improved.

The IPN localization is consistent with, but reduces the area of, the
Fermi-GBM final localization (GCN 32820).

A triangulation map and HEALPix FITS file are posted at
http://www.ioffe.ru/LEA/GRBs/GRB221022_T82557/IPN

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