GCN Circular 11851
S. Campana, L. Foschini, G. Tagliaferri, G. Ghisellini, S. Covino (INAF-OAB) report: We retrieved Fermi LAT publicly available data in near-real time from http://fermi.gsfc.nasa.gov/cgi-bin/ssc/LAT/LATDataQuery.cgi to search for high energy emission from GRB 110328 / Swift J164449.3+573451 within the time interval: 2011-03-27 00:00:00 UTC 2011-03-31 00:00:00 UTC We used LAT Science Tools 9.18.6 and the corresponding calibration files to perform the analysis. We analyzed data for each of the four days and in none of the corresponding datasets we detect the source. Following Foschini et al. (2011, http://arxiv.org/abs/1101.1085), we derived a 3 sigma upper limit of ~3x10^-7 ph/cm2/s in the 0.1-100 GeV energy band in each exposure (lasting 4-5 ks).