TITLE:   GCN CIRCULAR
NUMBER:  34330
SUBJECT: IPN triangulation of GRB 230803A
DATE:    23/08/03 20:39:17 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,

A. Goldstein, M. S. Briggs, C. Wilson-Hodge,
and E. Burns on behalf of the Fermi GBM 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 230803A
(Fermi GBM detection: Fermi GBM team, GCN 34325;
AstroSat CZTI detection: Navaneeth et al., GCN 34328)
has been detected by Fermi (GBM), Konus-Wind,
INTEGRAL (SPI-ACS), AstroSat (CZTI), and
Mars-Odyssey (HEND), so far, at about 5228 s UT (01:27:08).

We have triangulated it to a preliminary, 3 sigma error box
whose coordinates are:
 ---------------------------------------------
  RA(2000), deg                 Dec(2000), deg
 ---------------------------------------------
 Center:
  150.510 (10h 02m 02s) -64.987 (-64d 59' 12")
 Corners:
  147.455 (09h 49m 49s) -64.554 (-64d 33' 15")
  147.329 (09h 49m 19s) -64.581 (-64d 34' 51")
  153.688 (10h 14m 45s) -65.347 (-65d 20' 50")
  153.812 (10h 15m 15s) -65.315 (-65d 18' 54")
 ---------------------------------------------
The error box area is 431 sq. arcmin, and its maximum
dimension is 2.8 deg (the minimum one is 3 arcmin).
The Sun distance was 83 deg.

The IPN localization is consistent with, but reduces 
the area of, the Fermi-GBM final localization (GCN 34325).

This localization may be improved.

A triangulation map and HEALPix FITS file are posted at
http://www.ioffe.ru/LEA/GRBs/GRB230803_T05229/IPN/

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