TITLE: GCN CIRCULAR NUMBER: 17682 SUBJECT: GRB 150407A: Swift detection of a possible burst DATE: 15/04/07 19:31:57 GMT FROM: David Palmer at LANL GRB 150407A: Swift detection of a possible burst D. M. Palmer (LANL) reports on behalf of the Swift Team: At 00:31:10, the Swift Burst Alert Telescope (BAT) detected a possible source, GRB 150407A (trigger=637342), with marginal statistical significance, in two consecutive images of 6 minutes total duration. The BAT on-board calculated location is RA, Dec 216.603, 38.541 (J2000), which is RA(J2000) = 14h 26m 25s Dec(J2000) = 38d 32' 28" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). As is usual for image triggers, no obvious variation is visible in the BAT lightcurve. After ground discovery of this pair of possible detections, a ToO observation is planned to search for a counterpart afterglow. See GCN#17681 for details. -- David Palmer palmer@lanl.gov (505)665-6863 (voice) (505)665-4414 (fax)