Swift follow-up of BL Lacertae after a bright TeV flare

Astronomy and Astrophysics – Astronomy

Scientific paper

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Optical, Ultra-Violet, X-Ray, Agn, Blazar

Scientific paper

Following the VHE flare of the blazar BL Lacertae detected by VERITAS on June 28, 2011 (ATel #3459), a Swift target of opportunity observation was performed on June 30, 2011.
Swift/XRT data were taken in Photon Counting mode for a total exposure of 2.5 ksec. The X-ray spectrum (0.3-10 keV) of BL Lacertae can be fit by an absorbed (N_HI = 3.6x1021 cm-2, Ravasio et al. 2003, A&A, 408, 479) power law model with the photon index of 2.35+/-0.16.

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