TITLE: GCN CIRCULAR NUMBER: 5854 SUBJECT: GRB 061126: Swift detection of a burst DATE: 06/11/26 09:01:04 GMT FROM: Scott Barthelmy at NASA/GSFC B. Sbarufatti (INAF-IASFPA), S. D. Barthelmy (GSFC), V. Mangano (INAF-IASFPA), K. L. Page (U Leicester), D. M. Palmer (LANL), M. Stamatikos (NASA/ORAU) and D. E. Vanden Berk (PSU) report on behalf of the Swift Team: At 08:47:56 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 061126 (trigger=240766). Swift did not slew immediately to the burst location because of the Earth limb observing constraint. The BAT on-board calculated location is RA,Dec 86.625, +64.190 {05h 46m 30s, +64d 11' 24"} (J2000) with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows four somewhat overlapping peaks starting at ~T-5 sec and ending at ~T+35 sec (duration ~40 sec). The peak count rate was ~21000 counts/sec (15-350 keV), at ~6 sec after the trigger. XRT and UVOT observations will begin when the GRB comes out of Earth-limb constraint, at T+23 minutes.