IBAS is a system for the real time detection of the Gamma-ray bursts (GRBs) seen by the INTEGRAL satellite and the rapid distribution of their coordinates. IBAS runs automatically at the INTEGRAL Science Data Centre (ISDC), where the satellite data are received with a delay of only a few seconds. Alerts with the coordinates of the GRBs detected in the field of view of the INTEGRAL imager instrument are distributed by IBAS via internet and can be received by any interested user.  These localizations have a typical uncertainty radius of 3 arcmin (90% c.l.) and are available a few tens of seconds after the GRB start. The current rate of GRBs localization is about 1 per month. In addition, IBAS provides the light curves for about 0.5 GRB/day detected with the anticoincidence shield of the SPI instrument (no position is derived).