GCN Circular 44459
Subject
IPN triangulation of GRB 260429A
Event
Date
2026-05-04T15:06:16Z (5 days 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, 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, 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 260429A
(Ferm-GBM detection: The Fermi GBM team, GCN 44425;
Scotton, GCN 44430;
SVOM-GRM detection: Yu et al., GCN 44439)
was detected by Fermi (GBM trigger 799197847),
Konus-Wind, SVOM (GRM), and Mars-Odyssey (HEND)
at about 84242 s UT (23:24:02).
We have triangulated it to a preliminary, 3 sigma error box
whose coordinates are:
---------------------------------------------
RA(2000), deg Dec(2000), deg
---------------------------------------------
Center:
281.153 (18h 44m 37s) +17.279 (+17d 16' 44")
Corners:
281.115 (18h 44m 28s) +17.444 (+17d 26' 37")
281.161 (18h 44m 39s) +17.398 (+17d 23' 52")
281.192 (18h 44m 46s) +17.114 (+17d 06' 50")
281.146 (18h 44m 35s) +17.160 (+17d 09' 36")
---------------------------------------------
The error box area is 40 sq. arcmin, and its maximum
dimension is 20 arcmin (the minimum one is 2.3 arcmin).
The Sun distance was 109 deg.
This localization may be improved.
A triangulation map and HEALPix FITS files are posted at
http://www.ioffe.ru/LEA/GRBs/GRB260429_T84245/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.