TITLE: GCN CIRCULAR NUMBER: 16623 SUBJECT: GRB 140723A: Fermi-LAT detection DATE: 14/07/23 14:19:02 GMT FROM: Elisabetta Bissaldi at U.Innsbruk/IAPP E. Bissaldi (University & INFN Trieste), R. Desiante (Udine University & INFN Trieste), M. Axelsson (Stockholm University), D. Kocevski (NASA/GSFC) and F. Piron (LUPM) report on behalf of the Fermi-LAT team: At UT 01:36:30.73 on July 23rd, 2014, Fermi-LAT detected high-energy emission from GRB 140723A, which was also detected by Fermi-GBM (trigger427772193 / 140723067). The best LAT on-ground location is found to be (RA, Dec) = 210.63, -3.73 (deg, J2000) with an approximate error radius of 0.35 deg (90% containment, statistical error only). This was 55 deg from the LAT boresight at the time of the trigger. An image with the 68% and 90% containment regions have been posted at: http://slac.stanford.edu/~bissaldi/GRB140723A_LAT_tsmap.png The data from the Fermi-LAT show a significant increase in the event rate that is spatially and temporally correlated with the GBM emission with high significance. More than 170 photons above 100 MeV and 3 photons above 1 GeV are observed within 1200 s, before the spacecraft entered the SAA. The source entered the FoV again around 5800 s after the trigger. The highest-energy photon is a 1.8 GeV event, which is observed 163 s after the GBM trigger. A Swift ToO has been requested for this burst. The Fermi-LAT point of contact for this burst is Elisabetta Bissaldi (Elisabetta.Bissaldi@ts.infn.it). 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.