TITLE: GCN CIRCULAR NUMBER: 7892 SUBJECT: Swift-BAT trigger 314975 possible burst DATE: 08/06/21 16:06:44 GMT FROM: Scott Barthelmy at NASA/GSFC S. Immler (CRESST/GSFC/UMD), S. D. Barthelmy (GSFC), N. Gehrels (NASA/GSFC), C. Guidorzi (INAF-OAB), S. T. Holland (CRESST/USRA/GSFC), S. D. Hunsberger (PSU), J. A. Kennea (PSU), C. B. Markwardt (CRESST/GSFC/UMD), K. L. Page (U Leicester), D. M. Palmer (LANL), D. Perez (U Leicester), M. Stamatikos (NASA/ORAU), E. Troja (U Leicester/INAF-IASFPA) and H. Ziaeepour (UCL-MSSL) report on behalf of the Swift Team: At 15:50:35 UT, the Swift Burst Alert Telescope (BAT) triggered and located an automated trigger (314975). Swift did not slew because of an Earth limb constraint (for 38 minutes). The BAT on-board calculated location is RA, Dec 234.222, -73.269, which is RA(J2000) = 15h 36m 53s Dec(J2000) = -73d 16' 09" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows nothing obvious for this rate trigger. The lightcurve is consistant with noise. Because of the Earth limb constraint, we will not have NFI observations until T+38 minutes. And because we are in the Malindi downlink gap, we will not receive the full data set until T+9 hrs. Burst Advocate for this burst is S. Immler (immler AT milkyway.gsfc.nasa.gov). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)