TITLE:   GCN CIRCULAR
NUMBER:  37120
SUBJECT: IPN triangulation of GRB 240807A / EP 240807a
DATE:    24/08/09 22:41:04 GMT
FROM:    Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru>

A. Ridnaia, D. Frederiks, D. Svinkin, A. Lysenko,
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,

E. Bozzo and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team

and

J. DeLaunay, A. Tohuvavohu, S. Barthelmy, J. Cummings, H. Krimm,
and D. Palmer on behalf of the Swift-BAT team, report:

The long-duration GRB 240807A
(Fermi GBM detection: Fermi GBM team, GCN 37089;
SVOM-GRM detection: Wang et al., GCN 37111)
was detected by Fermi (GBM), Konus-Wind, in the waiting mode,
INTEGRAL (SPI-ACS), Swift (BAT), and SVOM (GRM)
at about 20565 s UT (05:42:45).
The burst was outside the coded field of view of the BAT.

We have triangulated it to a GBM-Konus annulus centered at
RA(2000)=295.559 deg (19h 42m 14s)  Dec(2000)=-22.821 deg (-22d 49' 15"),
whose radius is 32.402 +/- 32.402 deg (3 sigma).

This localization may be improved.

The fast X-ray transient EP 240807a (Fu et al., GCN 37088; Hu et al., GCN 37097)
is inside the annulus and is consistent with the Konus-Wind ecliptic latitude response, supporting the association of the GRB and EP 240807a.

A triangulation map and HEALPix FITS file are posted at
http://www.ioffe.ru/LEA/GRBs/GRB240807A/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.