TITLE: GCN CIRCULAR NUMBER: 35430 SUBJECT: IPN triangulation of GRB 231224A (short) DATE: 23/12/27 12:51:08 GMT FROM: Dmitry Svinkin at Ioffe Institute dmitrysvinkin@gmail.com
D. Svinkin, D. Frederiks, A. Ridnaia, A. Lysenko, on behalf of the IPN,
A. Goldstein, M. S. Briggs, C. Wilson-Hodge, and E. Burns on behalf of the Fermi GBM team,
and
E. Bozzo and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team, report:
The short-duration GRB 231224A (Fermi-GBM detection: The Fermi GBM team, GCN 35426) was detected by Fermi (GBM trigger 725143760) and INTEGRAL (SPI-ACS) at about 74956 s UT (20:49:16).
We have triangulated it to a GBM-SPI-ACS annulus centered at RA(2000)=230.929 deg (15h 23m 43s) Dec(2000)=-83.517 deg (-83d 30' 60"), whose radius is 32.644 +/- 5.664 deg (3 sigma).
The annulus combined with the Fermi-GBM final position (GCN 35426; glg_healpix_all_bn231224868_v00) gives ~792 sq. deg (3 sigma) localization region.
A triangulation map and HEALPix FITS file are posted at http://www.ioffe.ru/LEA/GRBs/GRB231224_T74955/IPN/
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