GCN Circular 40629
Subject
IPN triangulation of GRB 250529A
Event
Date
2025-06-05T15:23:42Z (a year 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,
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,
S. Barthelmy, J. Cummings, H. Krimm, D. Palmer, A. Tohuvavohu,
and J. DeLaunay on behalf of the Swift-BAT 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 long-duration GRB 250529A
(Fermi-GBM detection: Fermi GBM team, GCN 40567)
was detected by Fermi (GBM), Konus-Wind, Swift (BAT),
and Mars-Odyssey (HEND) at about 13576 s UT (03:46:16).
The burst was outside the coded field of view of the BAT.
We have triangulated it to a preliminary, 3 sigma error box
whose coordinates are:
---------------------------------------------
RA(2000), deg Dec(2000), deg
---------------------------------------------
Center:
18.193 (01h 12m 46s) +58.274 (+58d 16' 25")
Corners:
21.244 (01h 24m 58s) +56.039 (+56d 02' 19")
14.840 (00h 59m 22s) +60.456 (+60d 27' 22")
14.829 (00h 59m 19s) +60.366 (+60d 21' 57")
21.225 (01h 24m 54s) +55.944 (+55d 56' 37")
---------------------------------------------
The error box area is 1252 sq. arcmin, and its maximum
dimension is 5.6 deg (the minimum one is 4 arcmin).
The Sun distance was 48 deg.
This localization may be improved.
The IPN localization is consistent with, but reduces the area of,
the Fermi-GBM (GCN 40567) localization.
A triangulation map and HEALPix FITS file are posted at
http://www.ioffe.ru/LEA/GRBs/GRB250529_T13600/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.