TITLE: GCN CIRCULAR NUMBER: 17619 SUBJECT: GRB 150323B detected in ground analysis of Swift-BAT data DATE: 15/03/23 15:47:19 GMT FROM: Jay R. Cummings at NASA/GSFC/Swift J. R. Cummings (CPI) on behalf of the Swift-BAT science team At 09:28:38, Swift-BAT triggered (635929) on GRB 150323B. Imaging attempts were prematurely terminated by a preplanned slew. A bright source was detected in ground analysis at 260.447, +38.316, which is RA (J2000) 17h 21m 47.3s Dec (J2000) 38d 18' 59" with an estimated 90% error radius of 1.5 arcmin. The burst had multiple peaks with a T90 of about 60 seconds. We have event data for only the first peak. This is the same event as Fermi GBM 448795722. A Swift TOO has been requested.