TITLE: GCN CIRCULAR NUMBER: 6509 SUBJECT: GRB 070612: Swift detection of a burst DATE: 07/06/12 02:53:27 GMT FROM: Scott Barthelmy at NASA/GSFC D. Grupe (PSU), S. D. Barthelmy (GSFC), N. Gehrels (NASA/GSFC), S. T. Holland (CRESST/GSFC/USRA), J. A. Kennea (PSU), W. B. Landsman (NASA/GSFC), C. B. Markwardt (CRESST/GSFC/UMD), F. E. Marshall (NASA/GSFC), D. C. Morris (PSU), D. M. Palmer (LANL), M. Stamatikos (NASA/ORAU) and T. N. Ukwatta (GSFC/GWU) report on behalf of the Swift Team: At 02:38:45 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 070612 (trigger=282066). The BAT on-board calculated location is RA, Dec 121.385, +37.266 which is RA(J2000) = 08h 05m 32s Dec(J2000) = +37d 15' 56" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a single hard- spectrum FRED peak with a duration of about 30 sec. The peak count rate was ~1100 counts/sec (15-350 keV), at ~-1 sec after the trigger. Because of a Sun constraint, the spacecraft did not slew promptly to the BAT position, and so there are no XRT or UVOT data products to analyze. XRT and UVOT will not be able to observe this target until the end of August.