GCN Circular 23337
S. D. Barthelmy (GSFC), P. D'Avanzo (INAF-OAB) and A. Melandri (INAF-OAB) report on behalf of the Neil Gehrels Swift Observatory Team: At 08:15:34 UT, the Swift Burst Alert Telescope (BAT) triggered and located SGR1806-20 (trigger=866993). Swift did not slew to the source because of an observing constraint. The BAT on-board calculated location is RA, Dec 272.166, -20.380, which is RA(J2000) = 18h 08m 40s Dec(J2000) = -20d 22' 48" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a single peak with a duration of about 3 sec. The peak count rate was ~2400 counts/sec (15-350 keV), at ~0 sec after the trigger. Due to a Moon observing constraint, Swift cannot slew to the BAT position until 2018 October 16. No XRT or UVOT follow-ups are planned.