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GCN Circular 34258

Subject
IPN triangulation of GRB 230723A (short)
Date
2023-07-25T15:40:41Z (a year ago)
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,

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 short-duration GRB 230723A
(Fermi GBM detection: The Fermi GBM team, GCN 34232Not found
 
 
;
AGILE/MCAL detection: Panebianco et al., GCN 34237Not found
 
 
)
has been detected by Fermi (GBM), Konus-Wind, 
AGILE (MCAL, AC), and Mars-Odyssey (HEND), so far, 
at about 16723 s UT (04:38:43).

We have triangulated it to a preliminary, 3 sigma error box
whose coordinates are:
 ---------------------------------------------
  RA(2000), deg                 Dec(2000), deg
 ---------------------------------------------
 Center:
   22.909 (01h 31m 38s) -67.059 (-67d 03' 31")
 Corners:
   24.618 (01h 38m 28s) -66.230 (-66d 13' 48")
   24.638 (01h 38m 33s) -66.276 (-66d 16' 34")
   21.066 (01h 24m 16s) -67.859 (-67d 51' 31")
   21.054 (01h 24m 13s) -67.813 (-67d 48' 46")
 ---------------------------------------------
The error box area is 265 sq. arcmin, and its maximum
dimension is 2.1 deg (the minimum one is 2 arcmin).
The Sun distance was 111 deg.

The IPN localization is consistent with, but reduces 
the area of, the Fermi-GBM final localization (GCN 34232Not found
 
 
).

This localization may be improved.

A triangulation map and HEALPix FITS file are posted at
http://www.ioffe.ru/LEA/GRBs/GRB230723_T16725/IPN/

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