Fermi LAT detection of increasing gamma-ray activity of 3C 454.3

Details Fermi LAT detection of increasing gamma-ray activity of 3C 454.3 Fermi LAT detection of increasing gamma-ray activity of 3C 454.3

Apr 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010atel.2534....1w&link_type=abstract

The Astronomer's Telegram, #2534

Astronomy and Astrophysics

Astronomy

1

Gamma Ray, >Gev, Agn, Quasars, Transients

Scientific paper

The Large Area Telescope (LAT), one of the two instruments on the Fermi Gamma-ray Space Telescope, has detected an increasing gamma-ray activity from the blazar 3C 454.3. Preliminary analysis indicates that the source on 3rd April, 2010, has reached a very high state with an average gamma-ray flux over the day of (12 ± 1) ~ 10-6 photons cm-2 s-1 (E>100 MeV, statistical only). This flux level in the GeV range is comparable to that of the Vela pulsar, the brightest persistent source in the gamma-ray sky.

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