TITLE: GCN CIRCULAR NUMBER: 11085 SUBJECT: Swift-BAT trigger 431582 likely is IGR J17464-2811 DATE: 10/08/13 23:41:28 GMT FROM: Jonathan Gelbord at PSU/Swift J. M. Gelbord (PSU) reports on behalf of the Swift Team: At 21:03:29 UT BAT triggered on a source near the Galactic center (trigger # 431582). The slew was delayed by 51.8 minutes due to the Earth limb observing constraint. At the time of the BAT trigger, the source was identified by both the on-board BAT catalog and the GCN ground catalog as IGR J17475-2822. However, preliminary analysis of the XRT data taken an hour after the trigger reveals two other point sources within an 8 x 8 arcmin region centered on the BAT position. These sources are consistent with the positions of IGR J17464-2811 and 1RXS J174704.6-280843. These sources are 0.8 and 3.5 arcmin from the BAT position, respectively, with IGR J17464-2811 the brighter source by about a factor of 6. We consider IGR J17464-2811 to be the likely counterpart of the BAT trigger. This source is not in either the on-board BAT catalog or the GCN ground catalog. If it had been, it would have been the counterpart identified at the time of the trigger and not IGR J17475-2822.