GCN Circular 46094
Subject
IPN triangulation of GRB 261024D
Event
Date
2026-10-29T15:17:19Z (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,
E. Burns on behalf of the IPN,
A. Arya (IITB), G. Waratkar (Caltech/IITB), V. Bhalerao (IITB)
on behalf of AstroSat/CZTI 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 261024D
(AstroSat-CZTI detection: Goyal et al., GCN 46040;
NuSTAR-ACS detection: Waratkar & Grefenstette, GCN 46051;
Glowbug detection: Cheung et al., GCN 46053;
GECAM-B detection: Luo et al., GCN 46061;
Insight-HXMT/HE detection: Luo et al., GCN 46065)
was detected by AstroSat (CZTI), NuSTAR (ACS), SVOM (GRM),
Glowbug, GECAM-B, Insight (HXMT), Konus-Wind and
Mars-Odyssey (HEND) at about 77582 s UT (21:33:02).
We have triangulated it to a preliminary, 3 sigma error box
whose coordinates are:
---------------------------------------------
RA(2000), deg Dec(2000), deg
---------------------------------------------
Center:
212.913 (14h 11m 39s) +31.361 (+31d 21' 39")
Corners:
211.453 (14h 05m 49s) +23.721 (+23d 43' 15")
214.144 (14h 16m 35s) +38.561 (+38d 33' 38")
214.045 (14h 16m 11s) +38.529 (+38d 31' 45")
211.361 (14h 05m 27s) +23.673 (+23d 40' 23")
---------------------------------------------
The error box area is 1.1 sq. deg, and its maximum
dimension is 15 deg (the minimum one is 4 arcmin).
The Sun distance was 36 deg.
This localization may be improved.
A triangulation map and HEALPix FITS file are posted at
https://www.ioffe.ru/LEA/GRBs/GRB261024_T77582/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.