TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3995 SUBJECT: GRB 050916: XRT position DATE: 05/09/17 00:33:42 GMT FROM: David Morris at PSU/Swift-XRT D. Morris (PSU), D.N. Burrows (PSU) report on behalf of the Swift/XRT team: The Swift XRT began observing the long weak burst GRB 050916 (trigger #155408, Morris et al., GCN 3991) at 16:35:52 UT, but was unable to obtain an on-board centroid. Analysis of the initial ground-processed data finds a faint, fading, and uncataloged source at coordinates: RA(J2000) = 09 03 56.8 Dec(J2000) = -51 25 46.8 We estimate an uncertainty of 8 arcseconds (90% containment). This position lies 20 arcseconds from the BAT position reported in GCN 3991.