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The most powerful flaring activity from the nlsy1 pmn j0948+0022
(Oxford University Press (OUP), 2014-11-27)
We report on multifrequency observations performed during 2012 December-2013 August of the first narrow-line Seyfert 1 galaxy detected in gamma-rays, PMN J0948+0022 (z = 0.5846). A y -ray flare was observed by the Large ...