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IGR J17394-4638 is actually 4U 1735-44

ATEL # 1052; J. M. Miller (Univ. Michigan), M. D. Caballero-Garcia (LAEFF/INTA), E. Kuulkers (ESA/ESAC), M. Diaz Trigo (ESA/ESAC), on behalf of a larger collaboration
on 6 Apr 2007; 19:38 UT
Password Certification: Jon Miller (

Subjects: X-ray, Binaries, Neutron Stars, Transients

IGR J17394-4638, previously the subject of ATEL 1048 and ATEL 1049, is actually the well-known X-ray binary 4U 1735-44.

During the observations in which the source was "discovered", a slewing problem occurred and the INTEGRAL spacecraft failed to reach the expected attitude. The coordinates in the data are therefore incorrect, and IGR J17394-4638 is not a new source but rather the well-known X-ray binary 4U 1735-44. This problem can be corrected after data processing but is not obvious in the near real-time data that were scanned for prompt source detection and follow-up.

We wish to acknowledge INTEGRAL, especially Simona Soldi and Volker Beckmann, for quickly communicating the error.

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