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Optical observations of the IGR J18539+0727 field

ATel #158; N. Masetti (IASF/CNR, Bologna) and L. Foschini (IASF/CNR, Bologna & ISDC, Geneve)
on 9 May 2003; 15:09 UT
Credential Certification: Nicola Masetti (masetti@tesre.bo.cnr.it)

Subjects: Optical, X-ray, Gamma Ray, Binary, Black Hole, Neutron Star, Transient

We report optical observations of the field of the transient IGR J18539+0727 (Lutovinov et al., ATel #151) acquired with the BFOSC instrument mounted on the Bologna Astronomical Observatory 1.5-m "G.D. Cassini" telescope located in Loiano (Italy).

A single 20-minute R-band image was acquired starting at 01:43 UT of 2003 April 28 under a seeing of about 1.8 arcsec. The 3-sigma limiting magnitude of the image is R ~ 22.0.

Comparison with the red DSS-II survey indicates that no new object is present in the IGR J18539+0727 error box down to the survey limit (R ~ 21.5).