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GCN Circular 33803

IPN triangulation of GRB 230511D (short)
2023-05-15T12:15:18Z (24 days ago)
Dmitry Svinkin at Ioffe Institute <>
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 230511D (Fermi-GBM detection: The Fermi GBM team, GCN Circ. 33775) was detected by Fermi (GBM trigger 705537623) and INTEGRAL (SPI-ACS) at about 81618 s UT (22:40:18). We have triangulated it to a GBM-SPI-ACS annulus centered at RA(2000)=33.057 deg (02h 12m 14s) Dec(2000)=-40.890 deg (-40d 53' 25") whose radius is 63.439 +/- 5.830 deg (3 sigma). The annulus combined with the Fermi-GBM final position (GCN 33775; glg_healpix_all_bn230511945_v00) gives 530 sq. deg (3 sigma) localization region. A triangulation map and HEALPix FITS file are posted at
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