De_Angelis_Alessandro.pdf
De_Angelis_Alessandro.pdf De_Angelis_Alessandro.pdf
• z = 0.903 ± 0.003 • prompt spectrum detected, significant deviation from Band function at high E • High energy photon detected: 31 GeV at T o + 0.83 s [expected from Ellis & al. (12 ± 5) s] • tight constraint on Lorentz Invariance Violation: – E s1 = M QG > several M Planck • z = 1.8 ± 0.4 • one of the brightest GRBs observed by LAT • after prompt phase, power-low emission persists in the LAT data as late as 1 ks post trigger: highest E photon so far detected: 33.4 GeV, 82 s after GBM trigger [expected from Ellis & al. (26 ± 13) s] • much weaker constraints on LIV E s => Fermi rules, and 1 st order violations appear unlikely 73
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