TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4327 SUBJECT: GRB 051211B: a long GRB detected by INTEGRAL DATE: 05/12/11 23:22:59 GMT FROM: Sandro Mereghetti at IASF/CNR S. Mereghetti (IASF, Milano), D.Gotz (CEA, Saclay), N. Mowlavi, D.Eckert, M. Beck (ISDC, Versoix), and J. Borkowski (CAMK, Torun) on behalf of the IBAS Localization Team report: A GRB lasting about 80 s has been detected by IBAS in IBIS/ISGRI data at 22:05:44 on December 11 2005. Its refined coordinates (J2000) are: RA: 345.688 [degrees] DEC: 55.079 [degrees] with an uncertainty of 2.0 arcmin (90% c.l. radius). Its preliminary peak flux (20-200 keV, 1s integration time) is about 0.8 ph (8x10e-8 erg)/cmsq/s. Its fluence (20-200 keV, 80 s integration time) is 2x10e-6 erg/cmsq. A plot of the light curve will be posted at http://ibas.mi.iasf.cnr.it/IBAS_Results.html This message can be cited.