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| Miscellaneous :
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Landi et al. 2010ATel 3065:
- Swift observations
- Two sources are detected with XRT
- Second source favoured although on the border of 99% IBIS error box
- More significant (~10 sigma), and also a hard (detected > 3 keV)
- Coincident with an R ~16, B ~18 USNO-A2.0 object , and is also
listed in the 2MASS catalogue (J ~16, H ~15 and K ~14)
- Position is also compatible with 1RXS J215604.4+595607.
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Bikmaev et al. 2010ATel 3072:
- 2MASS J21560418+5956045 (=USNO-B1.0 1499-0325257) is the counterpart
- Sey 1 AGN at z = 0.208
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Tomsick et al. 2012 (ApJ):
- Chandra refinement of the X-ray position
- Confirm all previously suggested associtations
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Masetti et al. 2013 (A&A):
- Optical / NIR observation + spectroscopy of counterpart
- Sey 1 @ z=0.209
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