GCN Circular 45630

Subject

IPN triangulation of GRB 260916B (short)

Event

GRB 260916B

Date

2026-09-18T13:48:49Z (3 days 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, A. Lysenko, V. Panteleeva, D. Svinkin,
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 260916B
(Fermi-GBM detection: Fermi GBM team, GCN 45614Loading...
 
 ; Trigg, GCN 45616Loading...
 
 )
was detected by Fermi (GBM trigger 811264269), Konus-Wind,
and Mars-Odyssey (HEND) at about 54664 s UT (15:11:04).

We have triangulated it to a preliminary, 3 sigma error box
whose coordinates are:
---------------------------------------------
  RA(2000), deg                 Dec(2000), deg
 ---------------------------------------------
 Center:
  346.866 (23h 07m 28s) -32.509 (-32d 30' 34")
 Corners:
  346.902 (23h 07m 36s) -32.326 (-32d 19' 32")
  346.911 (23h 07m 39s) -32.713 (-32d 42' 46")
  346.829 (23h 07m 19s) -32.693 (-32d 41' 34")
  346.820 (23h 07m 17s) -32.305 (-32d 18' 19")
 ---------------------------------------------
The error box area is 96 sq. arcmin, and its maximum
dimension is 25 arcmin (the minimum one is 4 arcmin).
The Sun distance was 149 deg.

This localization may be improved.

A triangulation map and HEALPix FITS file are posted at
https://www.ioffe.ru/LEA/GRBs/GRB260916_T54667/IPN/
The HEALPix triangulation map is the multi-order HEALPix in units of
probability density.

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