GCN Circular 40757
Subject
IPN triangulation of GRB 250612C (short/hard)
Event
Date
2025-06-17T16:02:15Z (6 months ago)
From
Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>
Via
Web form
D. Svinkin, D. Frederiks, A. Lysenko, A. Ridnaia,
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
Y. Zhang, C. Wang, S. Xiong, J. Wei, and B. Cordier
on behalf of the SVOM-GRM team, report:
The bright, short-duration GRB 250612C
(Fermi-GBM detection: The Fermi GBM team, GCN 40704;
Neights and Meegan, GCN 40713;
BALROG localization: Preis and Greiner, GCN 40706;
SVOM-GRM detection: Wang et al., GCN 40708;
GRID detection: Yang et al., GCN 40732;
Konus-Wind detection: Frederiks et al., GCN 40746)
was detected by Fermi (GBM trigger 771432801), SVOM (GRM), Konus-Wind,
and GRID at about 53596 s UT (14:53:16).
We have triangulated it to a preliminary, 3 sigma error box
whose coordinates are:
-------------------------------
RA(2000), deg Dec(2000), deg
-------------------------------
Center:
115.493 18.574
Corners:
116.886 22.070
116.633 22.036
113.718 15.372
113.864 15.182
--------------------------------
The error box area is 5.5 sq. deg, and its maximum
dimension is 7 deg (the minimum one is 14.7 arcmin).
The Sun distance was 33 deg.
This localization may be improved.
The IPN localization is consistent with, but reduces the area of,
the Fermi-GBM (GCN 40704) and BALROG (GCN 40706) localizations.
A triangulation map and HEALPix FITS file are posted at
http://www.ioffe.ru/LEA/GRBs/GRB250612_T53591/IPN/
The HEALPix triangulation map is the multi-order HEALPix in units of
probability density.