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Aquila X-1 in activity

ATel #1553; S. A.Ilovaisky, C. Chevalier (Observatoire de Haute-Provence)
on 3 Jun 2008; 08:01 UT
Distributed as an Instant Email Notice Request For Observations
Credential Certification: Sergio A. Ilovaisky (ilovaisky@obs-hp.fr)

Subjects: Optical, X-ray, Binary, Transient

Referred to by ATel #: 1557, 1970, 2296

CCD images of the Aquila X-1/V1333 Aql field taken with the OHP 1.2-m telescope by R.Giraud on June 3.09 UT show the optical counterpart to be bright for the first time this season, at V=17.9, or 1.3 magnitudes above the quiescent combined flux of stars 'a' and 'e' (Chevalier et al 1999, A&A, 347, L51). Publicly available real-time 2-10 keV RXTE ASM data yield a counting rate of only about 3 c/s (39 mCrab), indicating this might be another weak-activity episode (see ATEL #1232). Obervations at other wavelengths are encouraged.