Mrk 421 on Feb. 22th, 2010
Markarian 421 (EUVE J1104+38.1, QSO B1101+384, RX J1104.4+3812,1FGL J1104.4+3812 ), a gamma-ray blazar with redshift z=0.03 (Healey, S. et al. 2008ApJS..175...97) currently exhibits a high energy flare, specially at X-ray (ATel #2444) and TeV energies (ATel #2443). This source showed a preliminary daily flux above 100 MeV of (0.4 +/- 0.1)E-6 photons/cm2/s with a photon index of 1.6 +/- 0.2 on Feb. 16th and a daily flux of (0.3 +/- 0.1)E-6 photons/cm2/s on Feb. 17th with a photon index 1.4 +/- 0.2 (errors statistical only).
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