INTEGRAL follow-up of GRO J1655-40
ATel #432; I. Brott (ISDC/Hamburg Observatory), J. Swank (GSFC), N. Mowlavi (ISDC, Geneva Observatory), C. Shrader (GSFC/USRA)
on 1 Mar 2005; 12:08 UT
Credential Certification: Nami Mowlavi (Nami.Mowlavi@obs.unige.ch)
Subjects: X-ray, Gamma Ray, Binary, Black Hole, Transient
A Target Of Opportunity observation of the X-ray binary GRO J1655-40
was triggered with INTEGRAL from 2005 February 24, 05h30 UTC to
February 28, 12h30 UTC.
The source was detected in the ISGRI instrument with a significance of
about 15 sigma. The Quick Look Analysis (QLA) found the flux slowly
increased during the first three days of the observation, from ~30
mCrab to ~60 mCrab in the 20-60 keV energy band and from ~40 mCrab to
~90 mCrab in the 60-200 keV band (15% accuracy level). No clear
evidence for further increase was seen in the QLA lightcurves after
February 27, 05h00.
During the intervals when the source was in its field of view, JEM-X
established upper limits of 20 mCrab in 1 hour integrations of 3-10
keV. These are consistent with contemporaneous RXTE PCA detections of
about 16 mCrab.