TITLE:   GCN CIRCULAR
NUMBER:  46045
SUBJECT: IPN triangulation of GRB 260730B
DATE:    26/10/26 14:08:24 GMT
FROM:    Dmitry Svinkin at Ioffe Institute <dmitrysvinkin@gmail.com>

A.S. Kozyrev, D.V. Golovin, M.L. Litvak, I.G. Mitrofanov, A.B. Sanin and J. Benkhoff 
on behalf of the MGNS/BepiColombo team,

G. Jones on behalf of the BepiColombo team,

D. Svinkin, D. Frederiks, A. Lysenko, V. Panteleeva, A. Ridnaia,
and T. Cline on behalf of the Konus-Wind team,

E. Burns on behalf of the IPN,

A. Arya (IITB), G. Waratkar (Caltech/IITB), V. Bhalerao (IITB)
on behalf of AstroSat/CZTI team,

Y. Shimizu (Kanagawa U), A. Yoshida, T. Sakamoto, S. Sugita,
Y. Kawakubo (AGU), K. Yamaoka (Nagoya U), S. Nakahira (JAXA),
Y. Asaoka (ICRR), S. Torii, Y. Akaike, K. Kobayashi (Waseda U),
T. Tamura (Kanagawa U), N. Cannady (GSFC), M. L. Cherry (LSU),
S. Ricciarini (U of Florence), P. S. Marrocchesi (U of Siena),
and the CALET collaboration, report:

The long-duration GRB 260730B
(NuSTAR-ACS detection: Waratkar et al., GCN 45262;
AstroSat-CZTI detection: Goyal et al., GCN 45265;
CALET-GBM detection: Shimizu et al., GCN 45284;
Glowbug detection: Cheung et al., GCN 45293)
was detected by NuSTAR (ACS), AstroSat (CZTI), CALET (GBM), Glowbug, 
and BepiColombo (MGNS) at about 47636 s UT (13:13:56).

We have triangulated it to the 3 sigma localization region
whose area is 12 sq. deg, and its maximum
dimension is 54 deg (the minimum one is 13 arcmin).

A triangulation map and HEALPix FITS files are posted at
http://www.ioffe.ru/LEA/GRBs/GRB260730_T47630/IPN/
The HEALPix triangulation map is the multi-order HEALPix in units of
probability density.