Fermi LAT detection of a GeV flare from blazar S5 1803+784

Details Fermi LAT detection of a GeV flare from blazar S5 1803+784 Fermi LAT detection of a GeV flare from blazar S5 1803+784

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010atel.2386....1d&link_type=abstract

The Astronomer's Telegram, #2386

Astronomy and Astrophysics

Astronomy

1

Gamma Ray, >Gev, Agn, Quasars

Scientific paper

The Large Area Telescope (LAT) on the Fermi Gamma-ray Space Telescope has observed an increasing gamma-ray flux from a source positionally coincident with the BL Lac object S5 1803+784 (RA=18h00m45.7s, DEC= +78d28'04.0", J2000, Johnston et al. 1995, AJ, 110, 880; z=0.68, Heeschen et al. 1987, AJ, 94, 1493). Preliminary analysis indicates that on January 11, 2010, the source was in a high state, with a gamma-ray flux (E>100MeV) of (0.9 ± 0.2)*10-6 photons/cm2/s (statistical uncertainty only), representing more than an order of magnitude increase over its average flux during the first 11 months of Fermi observations.

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