GCN Circular 46156
Subject
IPN triangulation of GRB 261024A
Event
Date
2026-11-05T13:34:57Z (a day ago)
From
Dmitry Svinkin at Ioffe Institute <svinkin@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,
D. Svinkin, D. Frederiks, A. Lysenko, V. Panteleeva, 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,
and
W. Boynton, C. Fellows, H. Enos, R. Starr, and A.S. Gardner
on behalf of the GRS-Odyssey GRB team, report:
The long-duration GRB 261024A
(Fermi-GBM detection: The Fermi GBM team, GCN 46019;
BALROG localization: Preis & Greiner, GCN 46020;
NuSTAR-ACS detection: Waratkar et al., GCN 46031;
SVOM-GRM detection: Luo et al., GCN 46057)
was detected by Fermi (GBM trigger 814551785), NuSTAR (ACS),
SVOM (GRM), Konus-Wind, and Mars-Odyssey (HEND)
at about 58981 s UT (16:23:01).
We have triangulated it to a preliminary, 3 sigma error box
whose coordinates are:
---------------------------------------------
RA(2000), deg Dec(2000), deg
---------------------------------------------
Center:
311.573 (20h 46m 17s) +60.244 (+60d 14' 38")
Corners:
309.513 (20h 38m 03s) +60.094 (+60d 05' 38")
309.466 (20h 37m 52s) +60.152 (+60d 09' 06")
313.652 (20h 54m 37s) +60.358 (+60d 21' 28")
313.692 (20h 54m 46s) +60.298 (+60d 17' 54")
---------------------------------------------
The error box area is 454 sq. arcmin, and its maximum
dimension is 2.1 deg (the minimum one is 4 arcmin).
The Sun distance was 106 deg.
This localization may be improved.
A triangulation map and HEALPix FITS files are posted at
http://www.ioffe.ru/LEA/GRBs/GRB261024_T58983/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.