Faculty of Science (FNWI) - Anton Pannekoek Institute for Astronomy (API)
Abstract
Following the report of the recent activity seen by Swift/BAT (ATel #1265) we note that the supergiant fast X-ray transient IGR J17544-2619 was also active about one and a half month earlier. During our INTEGRAL Galactic Bulge monitoring observations (see ATels #438, #874 and #1005) on UT 2007 Sep 21 04:10-07:52 the source flared on timescales of half an hour, from around the IBIS/ISGRI detection limits of one pointing (about 10 mCrab) up to 36 +/- 5 mCrab (20-60 keV).