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		| Paper: | 
		Recent X-ray Observations of BL Lac Objects | 
	 
	
		| Volume: | 
		299, High Energy Blazar Astronomy | 
	 
	
		| Page: | 
		53 | 
	 
	
		| Authors: | 
		Brinkmann, W.; Burwitz, V.; Papdakis, I.E.; den Herder, J.W.A. | 
	 
	
	
		| Abstract: | 
		The two very prominent BL Lac objects PKS 2155-304 and Mrk 421 have been observed repeatedly as calibration targets for the various instruments on board of XMM-Newton and Chandra.  We present a short discussion of these publicly available data and highlight first results and the potential capabilities of these X-ray missions. | 
	 
	
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