TITLE: GCN CIRCULAR NUMBER: 11318 SUBJECT: GRB 101008A: Swift detection of a burst DATE: 10/10/08 16:52:27 GMT FROM: David Palmer at LANL W. H. Baumgartner (GSFC/UMBC), A. P. Beardmore (U Leicester), N. Gehrels (NASA/GSFC), J. M. Gelbord (PSU), S. T. Holland (CRESST/USRA/GSFC), S. Immler (CRESST/GSFC/UMD), J. A. Kennea (PSU), N. P. M. Kuin (UCL-MSSL), C. Pagani (U Leicester), K. L. Page (U Leicester), D. M. Palmer (LANL), A. Rowlinson (U Leicester), B. Sbarufatti (INAF-OAB/IASFPA), M. H. Siegel (PSU), M. C. Stroh (PSU) and E. Troja (NASA/GSFC/ORAU) report on behalf of the Swift Team: At 16:43:15 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 101008A (trigger=435903). Swift could not slew to the burst location due to an Earth limb constraint. The BAT on-board calculated location is RA, Dec 328.891, +37.062 which is RA(J2000) = 21h 55m 34s Dec(J2000) = +37d 03' 44" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows many peaks in an overall FRED envelope structure with a duration of about 15 sec. The peak count rate was ~2500 counts/sec (15-350 keV), at ~1 sec after the trigger. Due to an observing constraint, Swift will not slew until T0+50.8 minutes. There will be no XRT or UVOT data until this time. Burst Advocate for this burst is W. H. Baumgartner (wayne AT milkyway.gsfc.nasa.gov). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)