INTEGRAL detected Aql X-1 in hard X-rays
ATel #452; S. A. Grebenev (IKI, Moscow), G. Belanger (SEA, Saclay), A. Bodaghee (ISDC, Versoix), N. Lund (DSRI, Copenhagen), W. Hermsen (SRON, Utrecht; UvA, Amsterdam), A. Parmar (ESA/ESTEC, Noordwijk), J.-P. Roques (CESR, Toulouse), M. Mas-Hesse (LAEFF, Madrid)
on 5 Apr 2005; 16:04 UT
Distributed as an Instant Email Notice Transients
Credential Certification: S.A.Grebenev (sergei@hea.iki.rssi.ru)
Subjects: Radio, Infra-Red, Optical, X-ray, Neutron Star, Transient
INTEGRAL observed the region near Aql X-1 on April 1.825-1.924, 2005 (UT) during the Galactic plane scan. The IBIS/ISGRI telescope detected the source at the flux level of 54+/-3 and 64+/-8 mCrab in the 18-45 and 45-80 keV bands, respectively. The source was as well detected in the standard 3-20 keV X-ray band with JEM-X at the flux level of about 35 mCrab. The combined spectrum can be well described with a single power law with a photon index of 1.98+/-0.06 in the broad 3-100 keV band.
Further observations will show if it is a temporal reactivation of the source in hard X-rays (a ``mini-outburst'' similar to that observed in March 2004) or the real beginning of a new X-ray outburst as was suspected by Maitra and Bailyn (ATEL #450) from their optical and infrared observations.
