TITLE: GCN CIRCULAR NUMBER: 23512 SUBJECT: GRB 181205A: a long GRB detected by INTEGRAL DATE: 18/12/05 09:42:26 GMT FROM: Sandro Mereghetti at IASF-Milano/INAF 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 60 s has been detected by IBAS in the IBIS/ISGRI data at 8:41 UT of December 5, 2018. The refined coordinates (J2000) are: R.A.= 199.9536 deg DEC.= 8.1975 deg with an uncertainty of 1.5 arcmin (90% c.l.). The burst had a peak flux of 0.8 counts/cm2/s (20-200 keV, 1-s integration time) and a fluence in the same energy range of about 2e-6 erg/cmq. A plot of the light curve will be posted at http://ibas.iasf-milano.inaf.it/IBAS_Results.html