August 1999 from the BeppoSAX Calendar
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BeppoSAX monitored the BL Lacertae object MKN 501
during a very high intensity state. These observations revealed spectacular
luminosity and spectral variability (right panel) associated with
simultaneous emission at extremely high energy (TeV band).
MKN501 is one of only three extragalactic sources detected at TeV
frequencies.
Courtesy of E. Pian, TeSRE Institute, CNR, Bologna, Italy
Images courtesy of the Agenzia Spaziale Italiana (ASI) and the
BeppoSAX Science Data Center (SDC).
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