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We report the extraordinary gamma-ray activity (E>100 MeV) of thegravitationally lensed blazar PKS 1830-211 (z=2.507) detected by AGILE betweenOctober and November 2010. The source experienced on October 14 a flux increaseof a factor of ~ 12 with respect to its average value and kept brightest atthis flux level (~ 500 x 10^{-8} ph cm^-2 sec^-1) for about 4 days. The 1-monthgamma-ray light curve across the flare showed a mean flux F(E>100 MeV)= 200 x10^{-8} ph cm^-2 sec^-1, which resulted in an enhancement by a factor of 4 withrespect to the average value. Following the gamma-ray flare, the source wasobserved in NIR-Optical energy bands at the Cerro Tololo Inter-AmericanObservatory and in X-rays by Swift/XRT and INTEGRAL/IBIS. The main result ofthese multifrequency observations is that the large variability observed ingamma-rays has not a significant counterpart at lower frequencies: no variationgreater than a factor of ~ 1.5 resulted in NIR and X-ray energy bands. PKS1830-211 is then a good "gamma-ray only flaring" blazar showing substantialvariability only above 10-100 MeV. We discuss the theoretical implications ofour findings.

The remarkable gamma-ray activity in the gravitationally lensed blazar PKS 1830-211