J004457+4123 (Sharov 21): not a remarkable nova in M 31 but a background quasar with a spectacular UV flare

Author: Meusinger H.   Henze M.   Birkle K.   Pietsch W.   Williams B.   Hatzidimitriou D.   Nesci R.   Mandel H.   Ertel S.   Hinze A.   Berthold T.  

Publisher: Edp Sciences

E-ISSN: 1432-0746|512|issue|A1-A1

ISSN: 0004-6361

Source: Astronomy & Astrophysics, Vol.512, Iss.issue, 2010-03, pp. : A1-A1

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