TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3003 SUBJECT: GRB 050129: a weak long GRB detected with INTEGRAL DATE: 05/01/31 09:01:13 GMT FROM: Diego Gotz at IASF-CNR D. Gotz, S. Mereghetti (IASF, Milano), A. Bodaghee, S. Shaw, M. Beck (ISDC, Versoix) and J. Borkowski (CAMK, Torun) on behalf of the IBAS Localization Team report: A 20 s long GRB has been detected by IBAS in IBIS/ISGRI data at 20:03:03 UT on Jan. 29. Due to its faintness no automatic IBAS Alert has been delivered. Its coordinates (J2000) are: RA: 252.7998 [degrees] DEC: -3.0788 [degrees] with an uncertainty of 2.7 arcmin (90% c.l. radius). Its peak flux (20-200 keV, 1s integration time) is about 0.26 ph (3E-08 erg)/cmsq/s, which classifies it among the faintest INTEGRAL GRBs. This message can be cited.