GCN Circular 8377
D.Gotz (CEA-Saclay), S.Mereghetti, A.Paizis (IASF-Milano), S. Soldi, V.Beckmann, M. Beck, M. Tuerler (ISDC, Versoix), and J. Borkowski (CAMK, Torun) on behalf of the IBAS Localization Team report: A GRB lasting about 34 s has been detected by IBAS in IBIS/ISGRI data at 06:51:31 UT of October 16. The coordinates (J2000) are: RA = 255.5725 [degrees] DEC= -23.3301 [degrees] with an uncertainty of 1.5 arcmin (90% c.l.). The burst is composed by two distinct peaks, and a preliminary spectral analysis gives a peak flux in the 20-200 keV range of about 2.4 ph/cmsq/s (1-s integration time) and a fluence over the same energy range of about 1.8x10e-6 erg/cmsq. Due to data gaps caused by telemetry saturation these values should be considered as lower limits. A plot of the light curve will be posted at http://ibas.iasf-milano.inaf.it/IBAS_Results.html This message can be cited.