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Erratum to ATel 3041: Fermi LAT detection of a rapid and extraordinary GeV outburst from 3C 454.3

ATEL # 3064; L. Escande ( on behalf of the Fermi Large Area Telescope Collaboration
on 2 Dec 2010; 16:22 UT
Password Certification: David J. Thompson (

Subjects: Gamma Ray, >GeV

In ATel #3041 we incorrectly claimed that the Fermi Large Area Telescope measured variability from the well-known gamma-ray blazar 3C 454.3 consistent with a doubling time of 3 hours. A corrupt data file caused the preliminary, semi-automated analysis, on which this claim was based, to miscalculate the source exposure over the period in question. This error did not affect the preliminary flux measurements presented in the first paragraph of the ATel.

An updated preliminary analysis of the variability timescale indicates an increase in the flux by a factor of four over the 12 hour period from 2011-11-16 15:00:00 to 2011-11-17 03:00:00.

The Fermi-LAT contact people for this source are Greg Madejski ( and Benoit Lott (

The Fermi LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden.

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