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GCN Circular 34752

Subject
IPN triangulation of GRB 230919A (short)
Date
2023-09-20T21:46:04Z (7 months ago)
From
Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru>
Via
Web form
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,

S. Barthelmy, J. Cummings, H. Krimm, D. Palmer, and A. Tohuvavohu
on behalf of the Swift-BAT 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 230919A
(Fermi-GBM detection: The Fermi GBM team, GCN Circ. 34737;
Scotton et al., GCN Circ. 34750;
AstroSat CZTI detection: Navaneeth et al., GCN Circ. 34742;
Swift/BAT-GUANO detection: DeLaunay et al., GCN Circ. 34747)
has been detected by Fermi (GBM trigger 716835508), Konus-Wind,
Mars-Odyssey (HEND), Swift (BAT), and AstroSat (CZTI),
so far, at about 61103 s UT (16:58:23).
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:
   71.620 (04h 46m 29s) +44.076 (+44d 04' 35")
 Corners:
   70.812 (04h 43m 15s) +45.562 (+45d 33' 43")
   70.802 (04h 43m 12s) +45.703 (+45d 42' 10")
   72.402 (04h 49m 37s) +42.484 (+42d 29' 04")
   72.411 (04h 49m 39s) +42.324 (+42d 19' 28")
 ---------------------------------------------
The error box area is 543 sq. arcmin, and its maximum
dimension is 3.6 deg (the minimum one is 3 arcmin).
The Sun distance was 100 deg.

The IPN localization is consistent with, but reduces the area of,
the Fermi-GBM final localization (GCN Circ. 34737).

This localization may be improved.

A triangulation map and HEALPix FITS file are posted at
http://www.ioffe.ru/LEA/GRBs/GRB230919_T61103/IPN/

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