AGILE detection of the flaring gamma-ray source AGL2021+4029 a possible rebrightening of a strong source in the Cygnus region

Integrating from 2007-11-02 12 00 UT to 2008-05-01 00 00, AGILE-GRID (Gamma-Ray Imaging Detector) detects a gamma-ray point source above 19 sigma, with a source flux in excess of 100e-8 ph/cm2/s at energies above 100 MeV. The source positional error box is centered at Galactic coordinates l = 78.31 deg, b = 2.05 deg, and has a radius of about 0.25 degrees. The nearest EGRET source is 3EG J2020+4017 at (l,b) = (78.05,2.08) with an error radius of 0.16 degrees.