GCN Circular 10307
D.Gotz (CEA-Saclay), S.Mereghetti, A. Paizis, (IASF- Milano), E. Bozzo, L. Gibaud, M. Beck (ISDC, Versoix), and J. Borkowski (CAMK, Torun) on behalf of the IBAS Localization Team report: a long gamma ray burst has been detected by IBAS in the IBIS/ISGRI data at 17:42:32 U.T. on January 3rd. It lasts about 40 s and its refined coordinates (J2000) are: R.A.: 112.366 [degrees] DEC.: -34.482 [degrees] with an uncertainty of 1.6 arcmin (90% c.l.). A preliminary analysis gives a peak flux in the 20-200 keV range of about 3.5 ph/cmsq/s (1 s integration time) and a fluence over the same energy range of about 3e-6 erg/cmsq. A plot of the light curve will be posted at http://ibas.iasf-milano.inaf.it/IBAS_Results.html This message can be cited.