TITLE:   GCN CIRCULAR
NUMBER:  45792
SUBJECT: IPN triangulation of GRB 260919A / EP260920a
DATE:    26/10/01 13:14:13 GMT
FROM:    Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>

D. Svinkin, D. Frederiks, A. Lysenko, V. Panteleeva, 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,

report:

The long-duration GRB 260919A was detected by Konus-Wind and
Fermi (GBM trigger 811554497) at about 85692 s UT (23:48:12).

We have triangulated it to the 3 sigma IPN localization region
whose area is 6556 sq. deg, and its maximum
dimension is 147 deg (the minimum one is ~66 deg).

This localization may be improved.

The fast X-ray transient EP260920a (Ni et al., GCN 45649) which was detected ~800 s after GRB 260919A, is inside the IPN localization region. The positional and temporal proximity of GRB 260919A with EP260920a may suggest that both events have a common origin.

A triangulation map and HEALPix FITS file are posted at
http://www.ioffe.ru/LEA/GRBs/GRB260919_T85725/IPN/
The HEALPix triangulation map is the multi-order HEALPix in units of
probability density.

The Konus-Wind time history and spectrum will be given
in a forthcoming GCN Circular.