Fermi LAT confirmation of a strong GeV flare from 4C 21.35 (PKS 1222+21)

Details Fermi LAT confirmation of a strong GeV flare from 4C 21.35 (PKS 1222+21) Fermi LAT confirmation of a strong GeV flare from 4C 21.35 (PKS 1222+21)

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009atel.2349....1c&link_type=abstract

The Astronomer's Telegram, #2349

Astronomy and Astrophysics

Astronomy

3

Gamma Ray, >Gev, Agn, Quasars

Scientific paper

The Large Area Telescope (LAT), one of the two instruments on the Fermi Gamma-ray Space Telescope, has observed an increasing gamma-ray flaring activity from a source positionally consistent with 4C 21.35 (also known as PKS 1222+21, z=0.432, RA: 12h24m54.4s, Dec: +21d22m46s, J2000). Preliminary analysis indicates that the source on December 15 2009 was in a high state with a gamma-ray flux (E>100MeV) of (3.4 +/- 0.5) x 10^-6 (statistical only) photons cm^-2 s^-1, which represents an increase of a factor of about 40 with respect to the averaged flux level in the past 11 months.

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