Fermi LAT detection of a GeV flare from blazar PKS 1622-253

Details Fermi LAT detection of a GeV flare from blazar PKS 1622-253 Fermi LAT detection of a GeV flare from blazar PKS 1622-253

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009atel.2231....1r&link_type=abstract

The Astronomer's Telegram, #2231

Astronomy and Astrophysics

Astronomy

Gamma Ray, >Gev, Transients

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 flux from a source positionally consistent with PKS 1622-253 (RA: 16h25m46.9s, Dec: -25d27'38", J2000). Preliminary analysis indicates that the source on Oct 4 was in a high state with a gamma-ray flux (E>100MeV) of (1.9 +/- 0.2) x 10-6 ph cm-2 s-1. This corresponds to a relative increase up to a factor of ~17 with respect to the average flux of PKS 1622-253 during the first year of Fermi operation.

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