TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4002 SUBJECT: GRB 050918 - A long GRB detected by INTEGRAL DATE: 05/09/19 14:59:36 GMT FROM: Sandro Mereghetti at IASF/CNR D. Gotz, S. Mereghetti (IASF, Milano), S. Shaw, N. Mowlavi, M. Beck, A. Neronov (ISDC, Versoix) and J. Borkowski (CAMK, Torun) on behalf of the IBAS Localization Team report: A 50 s long GRB has been detected by IBAS in IBIS/ISGRI data at 15:36:39 UT on September 18 2005. Its coordinates (J2000) are: RA: 267.6096 [degrees] DEC: -25.4141 [degrees] with an uncertainty of 2.8 arcmin (90% c.l. radius). No prompt IBAS Alert has been issued for this burst because its significance was below the threshold for automatic alert delivery. Its preliminary peak flux (20-200 keV, 1s integration time) is 0.7 ph (8E-08 erg)/cmsq/s. Its fluence (20-200 keV, 50 s integration time) is 2E-06 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.