A short hard X-ray flare from the blazar NRAO 530 observed by INTEGRAL

@article{Foschini2006ASH,
  title={A short hard X-ray flare from the blazar NRAO 530 observed by INTEGRAL},
  author={Luigi Foschini and Elena Pian and Laura Maraschi and Claudia M. Raiteri and Fabrizio Tavecchio and Gabriele Ghisellini and Gino Tosti and Giuseppe Malaguti and Guido Di Cocco},
  journal={Astronomy and Astrophysics},
  year={2006},
  volume={450},
  pages={77-81}
}
We report about a short flare from the blazar NRAO 530 occurred on 17 February 2004 and detected serendipitously by the IBIS/ISGRI detector on board INTEGRAL . In the $20{-}40$ keV energy range, the source, that is otherwise below the detection limit, is detected at a level of ≈ 2 $\times$ 10 -10  erg cm -2  s -1 during a time interval of less than 2000 s, which is about a factor 2 above the detection threshold. At other wavelengths, only nearly-simultaneous radio data are available (1… 

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