TITLE: GCN CIRCULAR NUMBER: 25788 SUBJECT: GRB 190919B: A long GRB detected by INTEGRAL DATE: 19/09/20 00:41:44 GMT FROM: Sandro Mereghetti at IASF-Milano/INAF 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 30 s has been detected by IBAS in the IBIS/ISGRI data at 23:46:40 UT of September 19, 2019. The refined coordinates (J2000) are: R.A.= 311.8862 deg DEC.= -44.7029 deg with an uncertainty of 1.5 arcmin (90% c.l.). The burst had a peak flux of 0.6 ph/cm2/s (20-200 keV, 1-s integration time) and a fluence in the same energy range of about 3e-7 erg/cm2. A plot of the light curve will be posted at http://ibas.iasf-milano.inaf.it/IBAS_Results.html