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In the early days of 2010 April, the blazar 3C 454.3 (  z = 0.859 ) underwent a strong γ‐ray outburst, reaching fluxes (  E  &gt; 100  MeV) in excess of 10 −5  photon cm −2  s −1 . The  Fermi Gamma‐ray Space Telescope  performed a 200 ks long pointed observation starting from 2010 April 5 19:38  utc . This allowed us to try probing the variability of the γ‐ray emission on time‐scales of hours or less. We found the variability on a few hours time‐scale. On subhour time‐scale we found no evidence of significant variability, although the present statistics is not yet conclusive and further observations are needed.

Does the gamma‐ray flux of the blazar 3C 454.3 vary on subhour time‐scales?