TITLE: GCN CIRCULAR NUMBER: 24936 SUBJECT: GRB 190701B: a long GRB detected by IBAS DATE: 19/07/01 11:18:25 GMT FROM: Diego Gotz at CEA D.Gotz (CEA, Saclay), S.Mereghetti (INAF, IASF-Milano), 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 23 s has been detected by IBAS in the IBIS/ISGRI data at 10:04:58 UT of July 1st, 2019. The refined coordinates (J2000) are: R.A.= 350.4091 deg DEC.= +64.3457 deg with an uncertainty of 1.1 arcmin (90% c.l.). The burst had a peak flux of 0.1 photons/cm2/s (20-200 keV, 1-s integration time) and a fluence in the same energy range of about 5.e-8 erg/cm2. A plot of the light curve will be posted at http://ibas.iasf-milano.inaf.it/IBAS_Results.html