TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4934 SUBJECT: SGR 1900+14: Swift-BAT detection of a cluster of outbursts DATE: 06/03/29 03:22:49 GMT FROM: Scott Barthelmy at NASA/GSFC P. Romano (INAF-OAB), S. D. Barthelmy (GSFC), J. A. Kennea (PSU), C. B. Markwardt (GSFC/UMD), A. Moretti (INAF-OAB) and D. M. Palmer (LANL) report on behalf of the Swift Team: At 02:53:09 UT, the Swift Burst Alert Telescope (BAT) triggered and located SGR 1900+14 (trigger=203127). Swift was already following up this source when this new outburst occurred. The BAT on-board calculated location is RA,Dec 286.804, +9.330 {19h 07m 13s, +09d 19' 48"} (J2000) with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve has multiple peaks. There are at least 8 peaks in the first 25 sec. There are about 4 more smaller peaks in the next 10 sec, and a peak at T+135 sec. The peak count rate was ~350,000 counts/sec (15-100 keV), at ~21 sec after the trigger. We note this is ~3 times brighter than the single-peak outburst detected on the previous orbit.