TITLE:   GCN CIRCULAR
NUMBER:  37630
SUBJECT: GRB 240929A long GRB detected by INTEGRAL
DATE:    24/09/29 21:00:52 GMT
FROM:    Sandro Mereghetti at IASF-Milano/INAF <sandro.mereghetti@inaf.it>

S.Mereghetti (INAF, IASF-Milano), D.Gotz (CEA, Saclay), C.Ferrigno, E.Bozzo, V.Savchenko (ISDC, Versoix), L.Ducci (IAAT, Germany and ISDC, Versoix) and J.Borkowski (CAMK, Torun) report:

a gamma ray burst lasting about 20 s has been detected by IBAS in the  IBIS/ISGRI data at 19:50:02  UT of 2024 September 29.

The refined coordinates (J2000) are:
R.A.=  2.4233 deg
DEC.=  74.8275 deg
with an uncertainty of  2   arcmin (90% c.l.).

A preliminary analysis gives a peak flux of  about 5  ph/cm2/s (20-200 keV, 1-s integration time) and a fluence in the same energy range of about 3e-6 erg/cmq.
Due to telemetry saturation, these values should be considered as lower limits.

This burst has also been detected by Fermi/GBM (GCN 37627).

A plot of the light curve will  be posted at
http://ibas.iasf-milano.inaf.it/IBAS_Results.html