GCN Circular 45031

Subject

IPN triangulation of GRB 260605A

Event

GRB 260605A

Date

2026-06-23T17:47:50Z (15 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,

C. Wang (IHEP), S. Xiong (IHEP), S. Zhang (IHEP), J. Wei (NAOC),
and B. Cordier (CEA) on behalf of the SVOM-GRM team,

C. Wang (IHEP), S. Xiong (IHEP), and S. Zhang (IHEP)
on behalf of the Insight-HXMT team,

E. Burns on behalf of the IPN,

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 260605A
(Insight-HXMT/HE detection: Zao et al., GCN 44849Loading...
 
 )
was detected by Insight (HXMT/HE), SVOM (GRM), Konus-Wind,
and Mars-Odyssey (HEND) at about 3868 s UT (01:04:28).

We have triangulated it to a preliminary, 3 sigma error box
whose coordinates are:
 ------------------------------
  RA(2000), deg  Dec(2000), deg
 ------------------------------
 Corners:
  110.4929       +37.9757
  110.4379       +38.1277
  108.8194       +18.8592
  108.8935       +19.0360
 ------------------------------
The error box area is 3003 sq. arcmin, and its maximum
dimension is 20.3 deg (the minimum one is 2.6 arcmin).
The Sun distance was ~27 deg.

This localization may be improved.

A triangulation map and HEALPix FITS files are posted at
http://www.ioffe.ru/LEA/GRBs/GRB260605_T03858/IPN
The HEALPix triangulation map is the multi-order HEALPix in units of
probability density.