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GCN Circular 33803

Subject
IPN triangulation of GRB 230511D (short)
Date
2023-05-15T12:15:18Z (a year ago)
From
Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>
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
http://www.ioffe.ru/LEA/GRBs/GRB230511_T81618/IPN


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