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GCN Circular 34637

Subject
IPN triangulation of GRB 230906A (short)
Date
2023-09-07T14:58:27Z (10 months ago)
From
Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>
Via
legacy email
A.S. Kozyrev, D.V. Golovin, M.L. Litvak, I.G. Mitrofanov, and A.B. Sanin
on behalf of the HEND/Mars Odyssey team,

D. Svinkin, D. Frederiks,  A. Lysenko, A. Ridnaia,
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 bright, short-duration GRB 230906A
(Fermi-GBM detection: The Fermi GBM team, GCN Circ. 34631)
was detected by Fermi (GBM trigger 715697712), INTEGRAL (SPI-ACS),
Konus-Wind, and Mars-Odyssey (HEND) at about 46507 s UT (12:55:07).

We have triangulated it to a preliminary, 3 sigma error box
whose coordinates are:
---------------------------------------------
  RA(2000), deg                 Dec(2000), deg
 ---------------------------------------------
 Center:
   79.757 (05h 19m 02s) -47.887 (-47d 53' 13")
 Corners:
   79.710 (05h 18m 50s) -47.945 (-47d 56' 41")
   79.748 (05h 19m 00s) -47.986 (-47d 59' 08")
   79.803 (05h 19m 13s) -47.829 (-47d 49' 45")
   79.765 (05h 19m 04s) -47.788 (-47d 47' 17")
 ---------------------------------------------
The error box area is 20 sq. arcmin, and its maximum
dimension is 12 arcmin (the minimum one is 2 arcmin).
The Sun distance was 91 deg.

The IPN localization is consistent with, but reduces the area of,
the Fermi-GBM final localization (glg_healpix_all_bn230715190_v00).

Swift ToO has been submitted (GCN 34636).

This localization may be improved.

A triangulation map and HEALPix FITS file are posted at
http://www.ioffe.ru/LEA/GRBs/GRB230906_T46507/IPN/

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


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