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Davide Donato (NASA/GSFC), C.C. Teddy Cheung (NRC, resident at NRL); on behalf of the Fermi Large Area Telescope Collaboration.
The Large Area Telescope (LAT), one of the two instruments on the Fermi Gamma-ray Space Telescope, has observed bright gamma-ray flares from two sources positionally consistent with the flat spectrum radio quasars HB89 1749+701 (RA: 17h48m32.8s, Dec: +70d05m51s, J2000, K.J. Johnston et al. 1995, AJ, 110, 880; z=0.77, P. A. Hughes et al. 1992, ApJ, 396, 469469H) and BZU J0742+5444 (RA: 07h42m39.8s, Dec: +54d44m25s, J2000, A. J. Beasley et al. 2002, ApJS, 141, 1313B; z=0.72, B. Punsly 1999, ApJ, 51, 141141P).
Preliminary analysis indicates that on February 26, 2011 the two sources were in a high states state with a gamma-ray fluxes flux (E>100MeV) of (1.3+/-0.2) x 10^-6 ph cm^-2 s^-1 and (1.2+/-0.3) x 10^-6 ph cm^-2 s^-1 (errors are statistical only), respectively. These Those values represent increases by factors an increase of a factor of ~50 and ~20 with respect to the fluxes source flux level reported in the 1FGL catalog (Abdo et al. 2010, ApJS, 188, 405), where which reports the average fluxes flux from August 2008 through June 2009 were reported.
Because Fermi operates in an all-sky scanning mode, regular gamma-ray monitoring of this source will continue. The Fermi LAT contact people for this source is Davide Donato (donato@milkyway.gsfc.nasa.gov).
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