TITLE: GCN CIRCULAR NUMBER: 18210 SUBJECT: INTEGRAL detection of GRB 150831A DATE: 15/08/31 11:41:33 GMT FROM: Sandro Mereghetti at IASF/CNR S.Mereghetti (IASF-Milano), D.Gotz (CEA, Saclay), C.Ferrigno, E.Bozzo, L.Ducci (ISDC, Versoix), and J.Borkowski (CAMK, Torun) on behalf of the IBAS Localization Team report: GRB 150831A (Lien et al. GCN 18209) has been detected by IBAS in the IBIS/ISGRI data with a significance slightly below the threshold for automatic alert delivery (IBAS Weak Alert n.7228 was distributed at 10:34:24 UT). The burst consists of a single peak with duration of 2 s and starting at 10:34:12 UT. The IBIS/ISGRI refined coordinates (J2000) are: R.A.= 221.0207 deg DEC.= -25.6474 deg with an uncertainty of 3 arcmin (90% c.l.). The burst had a fluence of about 3x10e-7 erg/cm2 in the the 20-200 keV energy range. A plot of the light curve will be posted at http://ibas.iasf-milano.inaf.it/IBAS_Results.html