GCN Circular 17661
J. R. Cummings (CPI) and D. M. Palmer (LANL) on behalf of the Swift-BAT science team: At 00:37:46 Swift-BAT triggered on GRB 150402A (trigger# 636865). Image attempts were prematurely terminated by a preplanned slew. A significant source was found in ground analysis at RA, Dec 173.658, +40.992, which is RA (J2000) 11h 34m 37.9s Dec (J2000) 40d 59' 33" with an estimated uncertainty radius of 2.5 arcmin (90% containment). The lightcurve shows two symmetrical peaks, each about 5 seconds long, the second harder and brighter. The counting rate in BAT of the brighter peak was about 1500 counts/sec. T90 was about 14 +- 2 seconds. A Swift TOO has been requested in order to locate the afterglow.