Observation of gamma-ray bursts and short duration transients with fermi large area telescope

Observations of Gamma-Ray Bursts with the Fermi Large Area Telescope have prompted theoretical advances and posed big challenges. The first Fermi/LAT GRB catalog, based on 35 detections collected in the first 3 years of observations, established many interesting features and opened new questions. The record-breaking GRB 130427A took the challenge even further, underlining even more the need for new theoretical developments. After a brief review of the main results, we present a new detection algorithm that is 40% more efficient than the previous one: With this procedure, as well as a new and improved event analysis ("Pass 8"), the Fermi/LAT now detects more than 100 GRBs in the first 6.5 years of observations. The characterization of this sample is ongoing. In addition, we are developing a blind search algorithm aimed to detect short-duration transients (< 3 hours). We briefly describe such development and its high potential for discoveries.