TITLE: GCN CIRCULAR NUMBER: 21202 SUBJECT: Swift trigger 755873: Swift BAT and XRT refined analysis DATE: 17/06/05 15:12:53 GMT FROM: Amy Lien at GSFC S. D. Barthelmy (GSFC), N. P. M. Kuin (UCL-MSSL), A. Y. Lien (GSFC/UMBC), K. L. Page (U Leicester), and D. M. Palmer (LANL) report on behalf of the Swift team: We report further analysis of the Swift/BAT trigger #755873 (Page et al., GCN Circ. 21193) using data from the recent telemetry downlink. The BAT ground analysis uses the data set from T-240 to T+962 sec. The BAT image significance is only 1.9 sigma. Also, the mask-weighted light curve does not show anything significant. XRT collected 4.5 ks of Photon Counting mode data between 134 s and 13.1 ks after the BAT trigger. No X-ray was detected within the 90% BAT error circle, to an 3-sigma upper limit of 3.1x10^-3 count s^-1. We therefore conclude that this trigger is due to noise fluctuation. The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/755873/BA/