TITLE: GCN CIRCULAR NUMBER: 11278 SUBJECT: GRB 100915B: a long GRB detected by INTEGRAL DATE: 10/09/15 07:19:49 GMT FROM: Sandro Mereghetti at IASF/CNR S.Mereghetti, A.Paizis (IASF- Milano), D.Gotz (CEA-Saclay), E. Bozzo, A.Taylor, M. Beck (ISDC, Versoix), and J. Borkowski (CAMK, Torun) on behalf of the IBAS Localization Team report: a gamma ray burst lasting about 4 s has been detected by IBAS in the IBIS/ISGRI data at 05:49:39 U.T. on September 15th. Its refined coordinates (J2000) are: RA= 85.3944 (deg) DEC=+25.0949 (deg) with an uncertainty of 2 arcmin (90% c.l.). A preliminary analysis gives a 20-200 keV fluence of about 3e-7 erg/cm2 and a peak flux of about 1 ph/cm2 s (1 s integration time) A plot of the light curve will be posted at http://ibas.iasf-milano.inaf.it/IBAS_Results.html This message can be cited.