GCN Circular 43691
Subject
IPN triangulation of GRB 260207B (short/hard with EE)
Event
Date
2026-02-10T20:33:53Z (a day 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,
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 short-duration GRB with extended emission GRB 260207B
(Fermi-GBM detection: Fermi GBM team, GCN 43629;
Sonawane & Bala, GCN 43634;
GECAM-B observation: Zao et al., GCN 43644;
AstroSat CZTI detection: Goyal et al., GCN 43680)
was detected by Fermi (GBM trigger 792162735),
Konus-Wind, GECAM-B, AstroSat (CZTI), and
Mars-Odyssey (HEND) at about 47531 s UT (13:12:11).
We have triangulated it to a preliminary, 3 sigma error box
whose coordinates are:
---------------------------------------------
RA(2000), deg Dec(2000), deg
---------------------------------------------
Center:
283.695 (18h 54m 47s) +51.643 (+51d 38' 34")
Corners:
284.134 (18h 56m 32s) +51.778 (+51d 46' 39")
283.959 (18h 55m 50s) +51.758 (+51d 45' 29")
283.258 (18h 53m 02s) +51.506 (+51d 30' 22")
283.432 (18h 53m 44s) +51.527 (+51d 31' 36")
---------------------------------------------
The error box area is 67 sq. arcmin, and its maximum
dimension is 36 arcmin (the minimum one is 2 arcmin).
The Sun distance was 74 deg.
A triangulation map and HEALPix FITS file are posted at
http://www.ioffe.ru/LEA/GRBs/GRB260207_T47529/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.