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| Miscellaneous :
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Kennea et al. 2005 Atel 673:
- J=11.5 2MASS object @ 2.9 arcseconds from the XRT position.
- also present in the USNO catalogue, with R=13.9 and B=15.3
- NH~1023 cm-2
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Halpern & Tyagi 2005 Atel 681):
- most likely counterpart is a Be star 2.8 arcseconds from the XRT position.
- also present in the USNO catalogue at B=14.98, R=13.24, and I=12.12.
- optical spectrum presents strong H-alpha (EW ~ 7 nm) and weak H-beta (EW ~ 0.6 nm)
emission lines, and diffuse interstellar bands.
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Masetti et al. 2006:
- confirm Be HMXB
- distance 6.4 kpc
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Kaur et al. 2008:
- Optical and X-ray observations
- Companion is B2 IVe.
- distance estimate of 4 kpc.
- X-ray spectra can either be fitted by an absorbed powerlaw
or an absorbed black body with highly variable absorption
- Possible detection of a pulse with period 469.2s.
- Corbet diagram =>orbital period of 216 to 561 days.
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Wang 2010:
- Analysis of INTEGRAL observations
- Did not find the potential pulse at 469s but
instead found a pulsation at 5.47 hr.
- IBIS spectra fitted with either
a bremsstrahlung or a power law model
- Claims for the detection of cyclotron absorption features at 35 and
62-64 keV => (In that case) kT=45 keV (bremss.), Γ=2.11 (power law) (outburst values)
- B~4e12 G for the neutron star
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