TITLE: GCN CIRCULAR NUMBER: 40757 SUBJECT: IPN triangulation of GRB 250612C (short/hard) DATE: 25/06/17 16:02:15 GMT FROM: Dmitry Svinkin at Ioffe Institute svinkin@mail.ioffe.ru
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.
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