TITLE: GCN CIRCULAR NUMBER: 8786 SUBJECT: GRB 090107B: a long GRB localized by INTEGRAL DATE: 09/01/07 17:05:19 GMT FROM: Diego Gotz at CEA D. Gotz (CEA-Saclay), S.Mereghetti, A.Paizis (IASF-Milano), C. Ferrigno, V.Beckmann, M. Beck (ISDC, Versoix), and J. Borkowski (CAMK, Torun) on behalf of the IBAS Localization Team report: A GRB lasting about 20 s has been detected by IBAS in IBIS/ISGRI data at 16:20:36 UT on January 7th. The refined coordinates (J2000) are: RA = 284.8075 [degrees] DEC= 59.5924 [degrees] with an uncertainty of 1.5 arcmin (90% c.l.). A preliminary analysis gives a peak flux in the 20-200 keV range of about 1.6 ph/cmsq/s (1-s integration time) and a fluence over the same energy range of about 1.5e-6 erg/cmsq. Both values have to be considered lower limits, since the burst is affected by telemetry saturation. A plot of the light curve will be posted at http://ibas.iasf-milano.inaf.it/IBAS_Results.html This message can be cited.