GCN Circular 20987
G.Vianello (Stanford), D.Kocevski (NASA/MSFC) report on behalf of the Fermi-LAT team: At 18:39:22.89 on April, 05, 2017 Fermi-LAT detected high-energy emission from GRB 170405A, which was also detected by Swift (Troja et al., GCN 20984) and Fermi/GBM (trigger 513110367/170405777). The best LAT on-ground location is found to be: RA, Dec = 219.37, -25.23 (J2000) with an error radius of 0.51 deg (90 % containment, statistical error only). This was 53 deg from the LAT boresight at the time of the trigger and triggered an autonomous repoint of the spacecraft. This position is compatible with the XRT position reported by Evans et al. (GCN 20985). The data from the Fermi-LAT show a significant increase in the event rate that is spatially and temporally correlated with the trigger with high significance. More than 13 events have been observed above 100 MeV which are spatially and temporally correlated with the GRB. The highest-energy photon is a 900 MeV event which is observed 445 seconds after the GBM trigger. We note that roughly 5 ks of data are currently available. We will provide an update, if necessary, as more data become available. The Fermi-LAT point of contact for this burst is Giacomo Vianello (firstname.lastname@example.org) The Fermi-LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden.