TITLE:   GCN CIRCULAR
NUMBER:  33200
SUBJECT: IPN triangulation of GRB 230116B (short)
DATE:    23/01/20 17:53:22 GMT
FROM:    Dmitry Svinkin at Ioffe Institute  <svinkin@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,

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,

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 230116B
(Fermi-GBM detection: the Fermi GBM team, GCN Circ. 33172)
has been detected by Fermi(GBM trigger 695552351),
Konus-Wind, INTEGRAL (SPI-ACS), and Mars-Odyssey (HEND), so far,
at about 32347 s UT (08:59:07).

We have triangulated it to a preliminary, 3 sigma error box
whose coordinates are:
  ---------------------------------------------
   RA(2000), deg                 Dec(2000), deg
  ---------------------------------------------
  Center:
   115.533 (07h 42m 08s) -43.027 (-43d 01' 39")
  Corners:
   115.712 (07h 42m 51s) -42.983 (-42d 58' 59")
   115.582 (07h 42m 20s) -43.076 (-43d 04' 34")
   115.353 (07h 41m 25s) -43.071 (-43d 04' 17")
   115.483 (07h 41m 56s) -42.979 (-42d 58' 44")
  ---------------------------------------------
The error box area is 58 sq. arcmin, and its maximum
dimension is 17 arcmin (the minimum one is 5.8 arcmin).
The Sun distance was 116 deg.

This box may be improved.

The IPN localization is consistent with, but reduces the area of,
the Fermi-GBM final localization (GCN 33172).

A triangulation map and HEALPix FITS file are posted at
http://www.ioffe.ru/LEA/GRBs/GRB230116_T32349/IPN

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