GCN Circular 19874
S. D. Barthelmy (GSFC), D. Malesani (DARK/NBI and DTU Space) and K. L. Page (U Leicester) report on behalf of the Swift Team: At 07:36:39 UT, the Swift Burst Alert Telescope (BAT) triggered on noise in the image domain near the known source IGR18027-2016 (trigger=710022). Swift executed a delayed slewed to the location. The BAT on-board calculated location is RA, Dec 183.074, -67.689, which is RA(J2000) = 12h 12m 18s Dec(J2000) = -67d 41' 19" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). This is an image trigger and as such, there is nothing significant in the real-time light curve. Given the weak significance (5.9 sigma) near a known source, it is very unlikely that this is a valid trigger. Final determination will be made when the full data set is downlinked. The XRT began observing the field at 08:05:33.4 UT, 1734.3 seconds after the BAT trigger. No source was detected in 451 s of promptly downlinked data. UVOT took a finding chart exposure of 150 seconds with the White filter starting 1736 seconds after the BAT trigger. There is no candidate afterglow in the rapidly available 2.7'x2.7' sub-image.