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GRB 080514B is the first gamma ray burst (GRB), since the time of EGRET, forwhich individual photons of energy above several tens of MeV have been detectedwith a pair-conversion tracker telescope. This burst was discovered with theItalian AGILE gamma-ray satellite. The GRB was localized with a cooperation byAGILE and the interplanetary network (IPN). The gamma-ray imager (GRID)estimate of the position, obtained before the SuperAGILE-IPN localization, isfound to be consistent with the burst position. The hard X-ray emissionobserved by SuperAGILE lasted about 7 s, while there is evidence that theemission above 30 MeV extends for a longer duration (at least ~13 s). Similarbehavior was seen in the past from a few other GRBs observed with EGRET.However, the latter measurements were affected, during the brightest phases, byinstrumental dead time effects, resulting in only lower limits to the burstintensity. Thanks to the small dead time of the AGILE/GRID we could assess thatin the case of GRB 080514B the gamma-ray to X-ray flux ratio changessignificantly between the prompt and extended emission phase.

AGILE detection of delayed gamma-ray emission from GRB 080514B