TITLE: GCN CIRCULAR NUMBER: 18291 SUBJECT: GRB 150912A: A long GRB detected by INTEGRAL DATE: 15/09/12 11:39:08 GMT FROM: Sandro Mereghetti at IASF/CNR S.Mereghetti (IASF-Milano), D.Gotz (CEA, Saclay), E.Bozzo, C.Ferrigno, L.Ducci (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 10:37:30 UT of 2015 September 12. The refined coordinates (J2000) are: R.A.= 248.4435 deg DEC.= -21.03376 deg with an uncertainty of 2 arcmin (90% c.l.). The burst had a peak flux of about 1.5 counts/cm2/s (20-200 keV, 1-s integration time) and a fluence in the same energy range of about 1e-6 erg/cmq. A plot of the light curve will be posted at http://ibas.iasf-milano.inaf.it/IBAS_Results.html