Fermi LAT detection of increasing gamma-ray activity of blazar PKS 1222+216

Details Fermi LAT detection of increasing gamma-ray activity of blazar PKS 1222+216 Fermi LAT detection of increasing gamma-ray activity of blazar PKS 1222+216

Apr 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009atel.2021....1l&link_type=abstract

The Astronomer's Telegram, #2021

Astronomy and Astrophysics

Astronomy

6

Gamma Ray, >Gev, Agn, Transients

Scientific paper

The Large Area Telescope (LAT), one of the two instruments on the Fermi Gamma-ray Space Telescope (formerly GLAST, launched June 11, 2008), has observed an increasing gamma-ray flux from a source positionally consistent with PKS 1222+216 (RA: 12h24m54.4s, DEC: +21d22m46s, J2000, z=0.43) associated with the EGRET source 3EG J1224+2118. Preliminary analysis indicates that the source on Apr 16, 2009 was in a high state with a gamma-ray flux (E>100MeV) of 4.6+/-1.6 (statistical only) *10^-7 ph cm^-2 s^-1, which represents an increase of a factor of 10 with respect to the average source flux level measured in the first 6 months of Fermi operations.

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