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Fermi LAT detection of a gamma-ray source positionally consistent with QSO B0133+47

ATEL # 1877; H. Takahashi (Hiroshima University), G. Tosti (INFN/University Perugia) on behalf of the Fermi Large Area Telescope Collaboration
on 16 Dec 2008; 23:57 UT
Password Certification: Hiromitsu Takahashi (

Subjects: Gamma Ray, >GeV, AGN, Quasars

The Large Area Telescope (LAT), one of two instruments on the Fermi Gamma-ray Space Telescope (formerly GLAST, launched June 11, 2008), has detected one gamma-ray source positionally consistent with QSO B0133+47 reported in ATEL #1874.
Preliminary analysis indicates that the source has been regularly detected by the LAT since the beginning of the all-sky scanning mode (August 2008). The LAT has not seen any strong variability of this source, and the average integral flux is about 1 x 10-7 ph cm-2 s-1 above 100 MeV with 30% systematic uncertainty. Because Fermi operates in the all-sky scanning mode, observing ~20% of the sky at any instant and all points in the sky every 3 hours, regular gamma-ray monitoring of this source will continue.

The Fermi LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden.

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