GCN Circular 44411

Subject

IPN triangulation of GRB 260424B (short)

Event

GRB 260424B

Date

2026-04-27T14:52:38Z (5 months 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, D. Svinkin,
and T. Cline on behalf of the Konus-Wind team,

E. Burns on behalf of the IPN,

C. Wang (IHEP), S. Xiong (IHEP), S. Zhang (IHEP),
J. Wei (NAOC),  B. Cordier (CEA) on behalf of the SVOM-GRM 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 260424B
(SVOM/GRM detection: Wang et al., GCN Circ. 44410Loading...
 
 )
was detected by Konus-Wind, SVOM (GRM), and
Mars-Odyssey (HEND) at about 85042 s UT (23:37:22).

We have triangulated it to a preliminary, 3 sigma error box
whose coordinates are:
 ---------------------------------------------
  RA(2000), deg                 Dec(2000), deg
 ---------------------------------------------
 Center:
  348.155 (23h 12m 37s) +41.208 (+41d 12' 30")
 Corners:
  348.267 (23h 13m 04s) +41.301 (+41d 18' 04")
  348.022 (23h 12m 05s) +41.176 (+41d 10' 32")
  348.027 (23h 12m 06s) +41.107 (+41d 06' 24")
  348.272 (23h 13m 05s) +41.232 (+41d 13' 56")
 ---------------------------------------------
The error box area is 47 sq. arcmin, and its maximum
dimension is 16 arcmin (the minimum one is 3.5 arcmin).
The Sun distance was 48 deg.

A triangulation map and HEALPix FITS file are posted at
http://www.ioffe.ru/LEA/GRBs/GRB260424_T85042/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.