Back
GCN Circular 35304

Subject
IPN triangulation of GRB 231205A
Date
2023-12-07T16:20:39Z (a year 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. Ridnaia, 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,

S.-L. Xiong, Y. Huang, X.-Y. Zhao, and P. Wang
on behalf of the GECAM 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 231205A
(Fermi-GBM detection: The Fermi GBM team, GCN Circ. 35263Loading...
 
 ;
GECAM-B detection: Tan et al., GCN Circ. 35266Loading...
 
 ;
ETJASMIN localization: Zhang et al., GCN Circ. 35268Loading...
 
 )
has been detected by Fermi-GBM (trigger 723435916), Konus-Wind,
INTEGRAL (SPI-ACS), GECAM-B (GRD), and Mars-Odyssey (HEND)
so far, at about  8711 s UT (02:25:11).

We have triangulated it to a preliminary, 3 sigma error box
whose coordinates are:
 ---------------------------------------------
  RA(2000), deg                 Dec(2000), deg
 ---------------------------------------------
 Center:
  202.936 (13h 31m 45s) +17.932 (+17d 55' 55")
 Corners:
  203.258 (13h 33m 02s) +18.299 (+18d 17' 58")
  202.683 (13h 30m 44s) +17.694 (+17d 41' 38")
  202.612 (13h 30m 27s) +17.557 (+17d 33' 25")
  203.188 (13h 32m 45s) +18.166 (+18d 09' 57")
 ---------------------------------------------
The error box area is 119 sq. arcmin, and its maximum
dimension is 58 arcmin (the minimum one is 2.4 arcmin).
The Sun distance was 62 deg.

This localization may be improved.

The IPN localization is consistent with, but reduces the area of,
the Fermi-GBM final localization and ETJASMIN localization.

A triangulation map and HEALPix FITS file are posted at
http://www.ioffe.ru/LEA/GRBs/GRB231205_T08710/IPN

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