GCN Circular 42614
Subject
IPN triangulation of GRB 251105B (possible sGRB with EE)
Event
Date
2025-11-07T15:12:08Z (a year 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,
Y. Zhang, C. Wang, S. Xiong, J. Wei, and B. Cordier
on behalf of the SVOM-GRM 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 possible short-duration GRB with extended emission GRB 251105B
(SVOM-GRM detection: Wang et al., GCN 42586;
Fermi-GBM detection: Hamburg eat al., GCN 42589;
AstroSat-CZTI detection: Harsha et al., GCN 42591)
was detected by SVOM (GRM), Konus-Wind, Fermi (GBM), AstroSat (CZTI),
and Mars-Odyssey (HEND) at about 3514 s UT (00:58:34).
We have triangulated it to a preliminary, 3 sigma error box
whose coordinates are:
---------------------------------------------
RA(2000), deg Dec(2000), deg
---------------------------------------------
Center:
277.814 (18h 31m 15s) +9.028 ( +9d 01' 39")
Corners:
277.022 (18h 28m 05s) +9.993 ( +9d 59' 36")
277.294 (18h 29m 11s) +9.729 ( +9d 43' 46")
278.607 (18h 34m 26s) +8.012 ( +8d 00' 43")
278.333 (18h 33m 20s) +8.303 ( +8d 18' 10")
---------------------------------------------
The error box area is 362 sq. arcmin, and its maximum
dimension is 2.5 deg (the minimum one is 3 arcmin).
The Sun distance was 62 deg.
A triangulation map and HEALPix FITS file are posted at
http://www.ioffe.ru/LEA/GRBs/GRB251105_T03511/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.