TITLE: GCN CIRCULAR NUMBER: 18009 SUBJECT: GRB 150710B detected in ground analysis of BAT data DATE: 15/07/11 14:23:08 GMT FROM: Jay R. Cummings at NASA/GSFC/Swift J. R. Cummings (CPI), D. M. Palmer (LANL), V. Pal'shin(Ioffe), and D. Svinkin (Ioffe) At 08:05:35, the bright GRB 150710B was observed by Swift/BAT during a preplanned Swiftslew. It was also seen by KONUS/WIND, and the KW team notified the BAT team of the event. In a mosaic of BAT images from photon- eventdata recorded during the slew, a bright source was found at RA, Dec 83.195, -46.963,which is: RA (J2000)05h 32m 46.9s Dec (J2000) -46d 57' 47" with an estimated uncertainty of 2 arcmin 90% containment. The burst had an estimated T90 of about 16 seconds. There were multiple bright peaks and an exponential decay. A Swift TOO has been requested in order to locate the afterglow.