GCN Circular 13165
G.Vianello (CIFS/SLAC), V. Vasileiou (CNRS/IN2P3/LUPM), D.Kocevski (Stanford) report on behalf of the Fermi LAT Team: Fermi-LAT has detected high energy emission from GRB 120328B in ground analysis. The GRB was triggered on by Fermi-GBM at 06:26:20 on March 28, 2012 (trigger 354608782, GCN 13163), and by Konus-Wind (GCN 13158). The best available position, provided by the IPN (GCN 13157), is ~66 deg off-axis, outside of the Fermi/LAT nominal field of view for the standard data analysis. Moreover, the zenith angle is ~105 deg, well within the region strongly contaminated by gamma-ray emission from the Earth's limb. Using a non-standard data selection most sensitive in the tens-of-MeV energy range and with a broader acceptance, we significantly detected the burst during the time interval of the prompt emission between T0 and ~T0+30 s. The significance of the excess corresponds to ~8 sigma. This data selection has insufficient spatial resolution to provide a reliable LAT localization. The GRB position entered the nominal field of view of the LAT ~2200 s after the trigger. A standard likelihood analysis on the time interval T0+2200 s - T0+3500 s does not show any excess at the position of the GRB. The Fermi LAT point of contact for this burst is Giacomo Vianello (firstname.lastname@example.org).