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The Large Area Telescope (LAT), one of the two instruments on the Fermi Gamma-ray Space Telescope, has observed an increasing a short, intense gamma-ray flux flare from a source positionally consistent with the low-frequency-peaked BL Lac object AP Librae (RA: 15h17m41.8s, Dec: -24d22m19s , J2000, K.J. Johnston et al. 1995, AJ, 110, 880) with a redshift of z=0.049. This source was recently detected at very-high energies (E>100 GeV) by the H.E.S.S. collaboration (ATel #2743).
Preliminary analysis indicates that the source on February 21, 2011, between 06:00 and 12:00 UT was in a high state with a gamma-ray flux (E>100MeV) of (1.4+/-0.6)E-06 photons cm-2 s-1, which represents an increase of a factor of ~20 with respect to the source flux level reported in the 1FGL.
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