TITLE: GCN CIRCULAR NUMBER: 17306 SUBJECT: Trigger 626581: Swift detection of GRO J1008-57 DATE: 15/01/18 01:11:05 GMT FROM: David Palmer at LANL D. N. Burrows (PSU), V. D'Elia (ASDC), F. E. Marshall (NASA/GSFC), D. M. Palmer (LANL) and B. Sbarufatti (INAF-OAB/PSU) report on behalf of the Swift Team: At 00:34:50 UT, the Swift Burst Alert Telescope (BAT) triggered and located the source GRO J1008-57 (trigger=626581). Swift did not slew to this source due to an Earth limb constraint. The BAT on-board calculated location is RA, Dec 152.370, -58.275 which is RA(J2000) = 10h 09m 29s Dec(J2000) = -58d 16' 30" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT lightcurve is not yet available for time interval covering this 10-minute image trigger. A few kiloseconds of XRT/UVOT observation is planned. This source has been rising steadily for the past 10 days in a bright apastron outburst (see Kreschmar et al. ATEL 6917). The BAT lightcurve can be seen at http://swift.gsfc.nasa.gov/results/transients/GROJ1008-57/