WE WILL PERFORM A TIME-RESOLVED DETAILED SPECTRAL ANALYSIS OF ALL JOINT GBM/LAT GRBS DETECTED BY THE LAT TRANSIENT FACTORY (LTF) TRIGGERED SEARCH (LTF-T). WE WILL USE THE RESULTS OF THIS UNPRECEDENTED CHARACTERIZATION OF THE PROMPT HIGH-ENERGY EMISSION FROM GRBS TO CONSTRAIN PHYSICAL MODELS OF GRBS. WE WILL ALSO CHARACTERIZE THE TRANSIENTS OF UNKNOWN ORIGIN FOUND BY THE BLIND SEARCH OF THE LTF (LTF-B) BY CROSS-CORRELATING THEM WITH EXISTING CATALOGS (SWIFT/XRT SWIFT/UVOT BZCAT...). WE WILL EXTEND THE LTF-B TO ENERGIES<100 MEV A REGION WHICH IS NOT EXPLORED BY EXISTING BLIND SEARCHES (ASP FAVA). WE WILL ALSO DEVELOP A PIPELINE TO RUN LTF- B IN REAL TIME WHICH WILL ALLOW THE PROMPT DISSEMINATION OF DISCOVERED TRANSIENTS FOR A QUICK MULTI-WAVELENGTH FOLLOW UP.