TITLE: GCN CIRCULAR NUMBER: 20021 SUBJECT: GRB 161010A: a long GRB detected by INTEGRAL DATE: 16/10/10 14:33:02 GMT FROM: Sandro Mereghetti at IASF-Milano/INAF S.Mereghetti (INAF, IASF-Milano), D.Gotz (CEA,Saclay), C.Ferrigno, E.Bozzo, M.Tuerler (ISDC, Versoix), and J.Borkowski (CAMK, Torun) on behalf of the IBAS Localization Team report: a gamma ray burst lasting about 30 s has been detected by IBAS in the IBIS/ISGRI data at 13:36:32 UT of 2016 October 10. The refined coordinates (J2000) are: R.A.= 275.2178 deg DEC.= -28.7868 deg with an uncertainty of 1.5 arcmin (90% c.l.). The burst had a peak flux larger than 6 ph/cm2/s (20-200 keV, 1-s integration time) and a fluence in the same energy range larger than 4e-6 erg/cmq. Note that due to telemetry saturation we can give only lower limits on fluence and peak flux. A plot of the light curve will be posted at http://ibas.iasf-milano.inaf.it/IBAS_Results.html