Dictionary of Nomenclature of Celestial Objects

ong which 2 are new detections named 'XR' by the authors.
in source:M 31 = NGC 224
Ref:=2001A&A...378..800O
byOSBORNE J.P. , BOROZDIN K.N., TRUDOLYUBOV S.P., PRIEDHORSKY W.C., SORIA R., SHIREY R., HAYTER C., LA PALOMBARA N., MASON K., MOLENDI S., PAERELS F., PIETSCH W., READ A.M., TIENGO A., WATSON M.G., WEST R.G.
 Astron. Astrophys., 378, 800-805 (2001)
  The central region of M 31 observed with XMM-Newton. II. Variability of the individual sources.
oTable 2: <[OBT2001] NN> (Nos 1-10)>, <[OBT2001] XR JHHMMSS.s+DDMMSS> N=2.

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